M+21=15

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Solution for M+21=15 equation: 


Simplifying
M + 21 = 15

Reorder the terms:
21 + M = 15

Solving
21 + M = 15

Solving for variable 'M'.

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

Add '-21' to each side of the equation.
21 + -21 + M = 15 + -21

Combine like terms: 21 + -21 = 0
0 + M = 15 + -21
M = 15 + -21

Combine like terms: 15 + -21 = -6
M = -6

Simplifying
M = -6

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