6=21-3m

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Solution for 6=21-3m equation:


Simplifying
6 = 21 + -3m

Solving
6 = 21 + -3m

Solving for variable 'm'.

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

Add '3m' to each side of the equation.
6 + 3m = 21 + -3m + 3m

Combine like terms: -3m + 3m = 0
6 + 3m = 21 + 0
6 + 3m = 21

Add '-6' to each side of the equation.
6 + -6 + 3m = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3m = 21 + -6
3m = 21 + -6

Combine like terms: 21 + -6 = 15
3m = 15

Divide each side by '3'.
m = 5

Simplifying
m = 5

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