3-4m-5m=21

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Solution for 3-4m-5m=21 equation:


Simplifying
3 + -4m + -5m = 21

Combine like terms: -4m + -5m = -9m
3 + -9m = 21

Solving
3 + -9m = 21

Solving for variable 'm'.

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

Add '-3' to each side of the equation.
3 + -3 + -9m = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -9m = 21 + -3
-9m = 21 + -3

Combine like terms: 21 + -3 = 18
-9m = 18

Divide each side by '-9'.
m = -2

Simplifying
m = -2

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