31=X+13

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Solution for 31=X+13 equation:


Simplifying
31 = X + 13

Reorder the terms:
31 = 13 + X

Solving
31 = 13 + 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.
31 + -1X = 13 + X + -1X

Combine like terms: X + -1X = 0
31 + -1X = 13 + 0
31 + -1X = 13

Add '-31' to each side of the equation.
31 + -31 + -1X = 13 + -31

Combine like terms: 31 + -31 = 0
0 + -1X = 13 + -31
-1X = 13 + -31

Combine like terms: 13 + -31 = -18
-1X = -18

Divide each side by '-1'.
X = 18

Simplifying
X = 18

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