13+X=31

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Solution for 13+X=31 equation: 


Simplifying
13 + X = 31

Solving
13 + X = 31

Solving for variable 'X'.

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

Add '-13' to each side of the equation.
13 + -13 + X = 31 + -13

Combine like terms: 13 + -13 = 0
0 + X = 31 + -13
X = 31 + -13

Combine like terms: 31 + -13 = 18
X = 18

Simplifying
X = 18

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