M-(-15)=12

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Solution for M-(-15)=12 equation: 


Simplifying
M + -1(-15) = 12

Multiply -1 * -15
M + 15 = 12

Reorder the terms:
15 + M = 12

Solving
15 + M = 12

Solving for variable 'M'.

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

Add '-15' to each side of the equation.
15 + -15 + M = 12 + -15

Combine like terms: 15 + -15 = 0
0 + M = 12 + -15
M = 12 + -15

Combine like terms: 12 + -15 = -3
M = -3

Simplifying
M = -3

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