M-7=-8

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Solution for M-7=-8 equation: 


Simplifying
M + -7 = -8

Reorder the terms:
-7 + M = -8

Solving
-7 + M = -8

Solving for variable 'M'.

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

Add '7' to each side of the equation.
-7 + 7 + M = -8 + 7

Combine like terms: -7 + 7 = 0
0 + M = -8 + 7
M = -8 + 7

Combine like terms: -8 + 7 = -1
M = -1

Simplifying
M = -1

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