Simplifying
25 + -3x = 40
Solving
25 + -3x = 40
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-25' to each side of the equation.
25 + -25 + -3x = 40 + -25
Combine like terms: 25 + -25 = 0
0 + -3x = 40 + -25
-3x = 40 + -25
Combine like terms: 40 + -25 = 15
-3x = 15
Divide each side by '-3'.
x = -5
Simplifying
x = -5