X+(X-12)=90

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Solution for X+(X-12)=90 equation:


Simplifying
X + (X + -12) = 90

Reorder the terms:
X + (-12 + X) = 90

Remove parenthesis around (-12 + X)
X + -12 + X = 90

Reorder the terms:
-12 + X + X = 90

Combine like terms: X + X = 2X
-12 + 2X = 90

Solving
-12 + 2X = 90

Solving for variable 'X'.

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

Add '12' to each side of the equation.
-12 + 12 + 2X = 90 + 12

Combine like terms: -12 + 12 = 0
0 + 2X = 90 + 12
2X = 90 + 12

Combine like terms: 90 + 12 = 102
2X = 102

Divide each side by '2'.
X = 51

Simplifying
X = 51

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