M+31=40

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Solution for M+31=40 equation: 


Simplifying
M + 31 = 40

Reorder the terms:
31 + M = 40

Solving
31 + M = 40

Solving for variable 'M'.

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

Add '-31' to each side of the equation.
31 + -31 + M = 40 + -31

Combine like terms: 31 + -31 = 0
0 + M = 40 + -31
M = 40 + -31

Combine like terms: 40 + -31 = 9
M = 9

Simplifying
M = 9

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