## pokemon23 4 years ago 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

1. pokemon23

20+x=55-4x

2. heisenberg

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

3. pokemon23

is this correct?

4. heisenberg

Yep that's right.

5. pokemon23

thanks

6. heisenberg

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

7. pokemon23

let me see

8. pokemon23

20=55-3x

9. pokemon23

75=-3x

10. heisenberg

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

11. heisenberg

same with the 55.

12. pokemon23

75=-5x

13. heisenberg

what about: 25 - 55 = ?

14. pokemon23

isn't 20

15. pokemon23

subtract 55

16. heisenberg

it's a negative number.

17. pokemon23

?????????

18. heisenberg

20 - 55 = -35

19. heisenberg

you have to subtract 55 from both sides.

20. pokemon23

where did you get -35

21. heisenberg

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

22. pokemon23

-35=-5x

23. heisenberg

that's right.

24. pokemon23

x=7

25. pokemon23

ty sir?

26. heisenberg

booyah.

27. pokemon23

lol