algibra 9th grade
If i have 3x- 3x do i get x or does it cancel out
Or, if you wish, think of the variable as standing for a thing, such as "apples."
3apples - 3 apples = 0apples, or just plain 0 (zero).
--any number minus itself is 0.
It cancels out. The best way to see this is by factoring out the x giving you x(3-3) = x(0). Anything times zero is zero, so it cancels out.