3(x-1)+12(x+9)=

Solution for 3(x-1)+12(x+9)= equation:

Simplifying
3(x + -1) + 12(x + 9) = 0

Reorder the terms:
3(-1 + x) + 12(x + 9) = 0
(-1 * 3 + x * 3) + 12(x + 9) = 0
(-3 + 3x) + 12(x + 9) = 0

Reorder the terms:
-3 + 3x + 12(9 + x) = 0
-3 + 3x + (9 * 12 + x * 12) = 0
-3 + 3x + (108 + 12x) = 0

Reorder the terms:
-3 + 108 + 3x + 12x = 0

Combine like terms: -3 + 108 = 105
105 + 3x + 12x = 0

Combine like terms: 3x + 12x = 15x
105 + 15x = 0

Solving
105 + 15x = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-105' to each side of the equation.
105 + -105 + 15x = 0 + -105

Combine like terms: 105 + -105 = 0
0 + 15x = 0 + -105
15x = 0 + -105

Combine like terms: 0 + -105 = -105
15x = -105

Divide each side by '15'.
x = -7

Simplifying
x = -7