90-18-x=57

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Solution for 90-18-x=57 equation: 


Simplifying
90 + -18 + -1x = 57

Combine like terms: 90 + -18 = 72
72 + -1x = 57

Solving
72 + -1x = 57

Solving for variable 'x'.

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

Add '-72' to each side of the equation.
72 + -72 + -1x = 57 + -72

Combine like terms: 72 + -72 = 0
0 + -1x = 57 + -72
-1x = 57 + -72

Combine like terms: 57 + -72 = -15
-1x = -15

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

Simplifying
x = 15

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