42-x=90

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Solution for 42-x=90 equation:


Simplifying
42 + -1x = 90

Solving
42 + -1x = 90

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 = 90 + -42

Combine like terms: 42 + -42 = 0
0 + -1x = 90 + -42
-1x = 90 + -42

Combine like terms: 90 + -42 = 48
-1x = 48

Divide each side by '-1'.
x = -48

Simplifying
x = -48

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