21-m=-19

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Solution for 21-m=-19 equation: 


Simplifying
21 + -1m = -19

Solving
21 + -1m = -19

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 + -1m = -19 + -21

Combine like terms: 21 + -21 = 0
0 + -1m = -19 + -21
-1m = -19 + -21

Combine like terms: -19 + -21 = -40
-1m = -40

Divide each side by '-1'.
m = 40

Simplifying
m = 40

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