M+-9=-13

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Solution for M+-9=-13 equation: 


Simplifying
M + -9 = -13

Reorder the terms:
-9 + M = -13

Solving
-9 + M = -13

Solving for variable 'M'.

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

Add '9' to each side of the equation.
-9 + 9 + M = -13 + 9

Combine like terms: -9 + 9 = 0
0 + M = -13 + 9
M = -13 + 9

Combine like terms: -13 + 9 = -4
M = -4

Simplifying
M = -4

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