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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