72-(12+9)=x

Solution for 72-(12+9)=x equation:

Simplifying
72 + -1(12 + 9) = x

Combine like terms: 12 + 9 = 21
72 + -1(21) = x

Multiply -1 * 21
72 + -21 = x

Combine like terms: 72 + -21 = 51
51 = x

Solving
51 = 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.
51 + -1x = x + -1x

Combine like terms: x + -1x = 0
51 + -1x = 0

Add '-51' to each side of the equation.
51 + -51 + -1x = 0 + -51

Combine like terms: 51 + -51 = 0
0 + -1x = 0 + -51
-1x = 0 + -51

Combine like terms: 0 + -51 = -51
-1x = -51

Divide each side by '-1'.
x = 51

Simplifying
x = 51