42-x=57

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Solution for 42-x=57 equation: 


Simplifying
42 + -1x = 57

Solving
42 + -1x = 57

Solving for variable 'x'.

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

Add '-42' to each side of the equation.
42 + -42 + -1x = 57 + -42

Combine like terms: 42 + -42 = 0
0 + -1x = 57 + -42
-1x = 57 + -42

Combine like terms: 57 + -42 = 15
-1x = 15

Divide each side by '-1'.
x = -15

Simplifying
x = -15

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