Question

How do you collect like terms: x-3x?

Answer 1

-2x

Explanation:

`x-3x` = `+1x - 3x`

There is always an understood one in front a variable.

+1 - 3 = -2

Since +1 x and -3x have the same variable the coefficients can be added.

so `x - 3x = -2x`