X-2+13=90

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Solution for X-2+13=90 equation: 


Simplifying
X + -2 + 13 = 90

Reorder the terms:
-2 + 13 + X = 90

Combine like terms: -2 + 13 = 11
11 + X = 90

Solving
11 + X = 90

Solving for variable 'X'.

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

Add '-11' to each side of the equation.
11 + -11 + X = 90 + -11

Combine like terms: 11 + -11 = 0
0 + X = 90 + -11
X = 90 + -11

Combine like terms: 90 + -11 = 79
X = 79

Simplifying
X = 79

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