Step-by-step explanation:
Simplifying
1.5x + -2.5x = 3
Combine like terms: 1.5x + -2.5x = -1x
-1x = 3
Solving
-1x = 3
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Divide each side by '-1'.
x = -3
Simplifying
x = -3
