90=X-18

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Solution for 90=X-18 equation: 


Simplifying
90 = X + -18

Reorder the terms:
90 = -18 + X

Solving
90 = -18 + X

Solving for variable 'X'.

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

Add '-1X' to each side of the equation.
90 + -1X = -18 + X + -1X

Combine like terms: X + -1X = 0
90 + -1X = -18 + 0
90 + -1X = -18

Add '-90' to each side of the equation.
90 + -90 + -1X = -18 + -90

Combine like terms: 90 + -90 = 0
0 + -1X = -18 + -90
-1X = -18 + -90

Combine like terms: -18 + -90 = -108
-1X = -108

Divide each side by '-1'.
X = 108

Simplifying
X = 108

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