-9+21=m-9

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Solution for -9+21=m-9 equation:


Simplifying
-9 + 21 = m + -9

Combine like terms: -9 + 21 = 12
12 = m + -9

Reorder the terms:
12 = -9 + m

Solving
12 = -9 + m

Solving for variable 'm'.

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

Add '-1m' to each side of the equation.
12 + -1m = -9 + m + -1m

Combine like terms: m + -1m = 0
12 + -1m = -9 + 0
12 + -1m = -9

Add '-12' to each side of the equation.
12 + -12 + -1m = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -1m = -9 + -12
-1m = -9 + -12

Combine like terms: -9 + -12 = -21
-1m = -21

Divide each side by '-1'.
m = 21

Simplifying
m = 21

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