6=21-m

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Solution for 6=21-m equation: 


Simplifying
6 = 21 + -1m

Solving
6 = 21 + -1m

Solving for variable 'm'.

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

Add 'm' to each side of the equation.
6 + m = 21 + -1m + m

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

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

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

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

Simplifying
m = 15

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