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Find the value of x I'm drawing it...

Mathematics
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The left angle is 3x+20 by the ways. I've tried this problem over and over and just don't get it!
the angles of a triangle all add up to 180, so add these three expressions and set them equal to 180 like this \[4x + 5 + 3x + 20 + 8x + 15 = 180\]

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combine like terms and solve for x
15x+40=180 15x=140 x=9.3 but when you plug them in it doesn't make snse?
sure it does, if we plug 9.3 back into the equation 4x + 5 + 3x + 20 + 8x + 15 = 180 the result will be 180 = 180 which means we've found the right number for x

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