9-m=20

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Solution for 9-m=20 equation: 


Simplifying
9 + -1m = 20

Solving
9 + -1m = 20

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 + -1m = 20 + -9

Combine like terms: 9 + -9 = 0
0 + -1m = 20 + -9
-1m = 20 + -9

Combine like terms: 20 + -9 = 11
-1m = 11

Divide each side by '-1'.
m = -11

Simplifying
m = -11

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