M+13=31

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Solution for M+13=31 equation: 


Simplifying
M + 13 = 31

Reorder the terms:
13 + M = 31

Solving
13 + M = 31

Solving for variable 'M'.

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

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

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

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

Simplifying
M = 18

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