120=128-x

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Solution for 120=128-x equation:


Simplifying
120 = 128 + -1x

Solving
120 = 128 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
120 + x = 128 + -1x + x

Combine like terms: -1x + x = 0
120 + x = 128 + 0
120 + x = 128

Add '-120' to each side of the equation.
120 + -120 + x = 128 + -120

Combine like terms: 120 + -120 = 0
0 + x = 128 + -120
x = 128 + -120

Combine like terms: 128 + -120 = 8
x = 8

Simplifying
x = 8

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