2m-21=-3

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Solution for 2m-21=-3 equation: 


Simplifying
2m + -21 = -3

Reorder the terms:
-21 + 2m = -3

Solving
-21 + 2m = -3

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 + 2m = -3 + 21

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

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

Divide each side by '2'.
m = 9

Simplifying
m = 9

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