-3+2m=-21

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Solution for -3+2m=-21 equation: 


Simplifying
-3 + 2m = -21

Solving
-3 + 2m = -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 + 2m = -21 + 3

Combine like terms: -3 + 3 = 0
0 + 2m = -21 + 3
2m = -21 + 3

Combine like terms: -21 + 3 = -18
2m = -18

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

Simplifying
m = -9

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