120-21=9x

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Solution for 120-21=9x equation:


Simplifying
120 + -21 = 9x

Combine like terms: 120 + -21 = 99
99 = 9x

Solving
99 = 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
99 + -9x = 9x + -9x

Combine like terms: 9x + -9x = 0
99 + -9x = 0

Add '-99' to each side of the equation.
99 + -99 + -9x = 0 + -99

Combine like terms: 99 + -99 = 0
0 + -9x = 0 + -99
-9x = 0 + -99

Combine like terms: 0 + -99 = -99
-9x = -99

Divide each side by '-9'.
x = 11

Simplifying
x = 11

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