X+(X-18)=90

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Solution for X+(X-18)=90 equation:


Simplifying
X + (X + -18) = 90

Reorder the terms:
X + (-18 + X) = 90

Remove parenthesis around (-18 + X)
X + -18 + X = 90

Reorder the terms:
-18 + X + X = 90

Combine like terms: X + X = 2X
-18 + 2X = 90

Solving
-18 + 2X = 90

Solving for variable 'X'.

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

Add '18' to each side of the equation.
-18 + 18 + 2X = 90 + 18

Combine like terms: -18 + 18 = 0
0 + 2X = 90 + 18
2X = 90 + 18

Combine like terms: 90 + 18 = 108
2X = 108

Divide each side by '2'.
X = 54

Simplifying
X = 54

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