45 = 12 + 3x
Solving for variable 'x'.
Move all terms containing x to the
left, all other terms to the right. Add '-3x' to each side of the equation.
45 + -3x = 12 + 3x + -3x
Combine like terms: 3x + -3x = 0
45 + -3x = 12 + 0
45 + -3x = 12
Add '-45' to each side of the equation.
45 + -45 + -3x = 12 + -45
Combine like terms: 45 + -45 = 0
0 + -3x = 12 + -45
-3x = 12 + -45
Combine like terms: 12 + -45 = -33
-3x = -33
Divide each side by '-3'.
x = 11
