-21M-13=78

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Solution for -21M-13=78 equation: 


Simplifying
-21M + -13 = 78

Reorder the terms:
-13 + -21M = 78

Solving
-13 + -21M = 78

Solving for variable 'M'.

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

Add '13' to each side of the equation.
-13 + 13 + -21M = 78 + 13

Combine like terms: -13 + 13 = 0
0 + -21M = 78 + 13
-21M = 78 + 13

Combine like terms: 78 + 13 = 91
-21M = 91

Divide each side by '-21'.
M = -4.333333333

Simplifying
M = -4.333333333

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