180=21-x

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Solution for 180=21-x equation:


Simplifying
180 = 21 + -1x

Solving
180 = 21 + -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.
180 + x = 21 + -1x + x

Combine like terms: -1x + x = 0
180 + x = 21 + 0
180 + x = 21

Add '-180' to each side of the equation.
180 + -180 + x = 21 + -180

Combine like terms: 180 + -180 = 0
0 + x = 21 + -180
x = 21 + -180

Combine like terms: 21 + -180 = -159
x = -159

Simplifying
x = -159

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