80=120-x

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Solution for 80=120-x equation:


Simplifying
80 = 120 + -1x

Solving
80 = 120 + -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.
80 + x = 120 + -1x + x

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

Add '-80' to each side of the equation.
80 + -80 + x = 120 + -80

Combine like terms: 80 + -80 = 0
0 + x = 120 + -80
x = 120 + -80

Combine like terms: 120 + -80 = 40
x = 40

Simplifying
x = 40

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