M+3+5=21

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Solution for M+3+5=21 equation: 


Simplifying
M + 3 + 5 = 21

Reorder the terms:
3 + 5 + M = 21

Combine like terms: 3 + 5 = 8
8 + M = 21

Solving
8 + M = 21

Solving for variable 'M'.

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

Add '-8' to each side of the equation.
8 + -8 + M = 21 + -8

Combine like terms: 8 + -8 = 0
0 + M = 21 + -8
M = 21 + -8

Combine like terms: 21 + -8 = 13
M = 13

Simplifying
M = 13

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