7m-13m-21=9

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Solution for 7m-13m-21=9 equation:


Simplifying
7m + -13m + -21 = 9

Reorder the terms:
-21 + 7m + -13m = 9

Combine like terms: 7m + -13m = -6m
-21 + -6m = 9

Solving
-21 + -6m = 9

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 + -6m = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -6m = 9 + 21
-6m = 9 + 21

Combine like terms: 9 + 21 = 30
-6m = 30

Divide each side by '-6'.
m = -5

Simplifying
m = -5

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