Question

Which of the following equations has the solution set {0}?

1)-14m - 7m + 1 = -7m + 1
2)-14m + 7m + 1 = -7m + 2
3)14m - 7m - 1 = -7m + 1

Answer 1

-14m - 7m + 1 = -7m + 1
-21m + 1 = -7m + 1 --- add 7m to both sides
-21m + 1 = 1 -- subtract 1 from both sides
-21m = 0
m = 0/-21
m = 0