3(45-12)+30=x

Solution for 3(45-12)+30=x equation:

Simplifying
3(45 + -12) + 30 = x

Combine like terms: 45 + -12 = 33
3(33) + 30 = x

Multiply 3 * 33
99 + 30 = x

Combine like terms: 99 + 30 = 129
129 = x

Solving
129 = x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
129 + -1x = x + -1x

Combine like terms: x + -1x = 0
129 + -1x = 0

Add '-129' to each side of the equation.
129 + -129 + -1x = 0 + -129

Combine like terms: 129 + -129 = 0
0 + -1x = 0 + -129
-1x = 0 + -129

Combine like terms: 0 + -129 = -129
-1x = -129

Divide each side by '-1'.
x = 129

Simplifying
x = 129