-57=21-x

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Solution for -57=21-x equation:


Simplifying
-57 = 21 + -1x

Solving
-57 = 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.
-57 + x = 21 + -1x + x

Combine like terms: -1x + x = 0
-57 + x = 21 + 0
-57 + x = 21

Add '57' to each side of the equation.
-57 + 57 + x = 21 + 57

Combine like terms: -57 + 57 = 0
0 + x = 21 + 57
x = 21 + 57

Combine like terms: 21 + 57 = 78
x = 78

Simplifying
x = 78

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