12+(18-x)=9

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Solution for 12+(18-x)=9 equation:


Simplifying
12 + (18 + -1x) = 9

Remove parenthesis around (18 + -1x)
12 + 18 + -1x = 9

Combine like terms: 12 + 18 = 30
30 + -1x = 9

Solving
30 + -1x = 9

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + -1x = 9 + -30

Combine like terms: 30 + -30 = 0
0 + -1x = 9 + -30
-1x = 9 + -30

Combine like terms: 9 + -30 = -21
-1x = -21

Divide each side by '-1'.
x = 21

Simplifying
x = 21

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