pokemon23

If 20 is added to a number the result is the same as 55 decreased by four times the number.Find the number. Help me If 20 is added to a number the result is the same as 55 decreased by four times the number.Find the number. Help me @Mathematics

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pokemon23

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20+x=55-4x

heisenberg

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setup an equation with simple algebra. The "unknown" = the "number."

pokemon23

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is this correct?

heisenberg

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Yep that's right.

pokemon23

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thanks

heisenberg

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can you solve those together? there are a few techniques for this.

pokemon23

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let me see

pokemon23

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20=55-3x

pokemon23

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75=-3x

heisenberg

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not quite. to get rid of the x on the left, subtract x to both sides.
-4x - (1)x = -5x

heisenberg

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same with the 55.

pokemon23

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75=-5x

heisenberg

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what about:
25 - 55 = ?

pokemon23

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isn't 20

pokemon23

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subtract 55

heisenberg

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it's a negative number.

pokemon23

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?????????

heisenberg

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20 - 55 = -35

heisenberg

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you have to subtract 55 from both sides.

pokemon23

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where did you get -35

heisenberg

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20 - 55 = 20 + -55 = -55 + 20 = -35

pokemon23

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-35=-5x

heisenberg

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that's right.

pokemon23

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x=7

pokemon23

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ty sir?

heisenberg

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booyah.

pokemon23

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lol