120=90+x

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Solution for 120=90+x equation:


Simplifying
120 = 90 + x

Solving
120 = 90 + 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.
120 + -1x = 90 + x + -1x

Combine like terms: x + -1x = 0
120 + -1x = 90 + 0
120 + -1x = 90

Add '-120' to each side of the equation.
120 + -120 + -1x = 90 + -120

Combine like terms: 120 + -120 = 0
0 + -1x = 90 + -120
-1x = 90 + -120

Combine like terms: 90 + -120 = -30
-1x = -30

Divide each side by '-1'.
x = 30

Simplifying
x = 30

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