158=42-x

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Solution for 158=42-x equation:


Simplifying
158 = 42 + -1x

Solving
158 = 42 + -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.
158 + x = 42 + -1x + x

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

Add '-158' to each side of the equation.
158 + -158 + x = 42 + -158

Combine like terms: 158 + -158 = 0
0 + x = 42 + -158
x = 42 + -158

Combine like terms: 42 + -158 = -116
x = -116

Simplifying
x = -116

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