13=7-3m

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Solution for 13=7-3m equation:


Simplifying
13 = 7 + -3m

Solving
13 = 7 + -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.
13 + 3m = 7 + -3m + 3m

Combine like terms: -3m + 3m = 0
13 + 3m = 7 + 0
13 + 3m = 7

Add '-13' to each side of the equation.
13 + -13 + 3m = 7 + -13

Combine like terms: 13 + -13 = 0
0 + 3m = 7 + -13
3m = 7 + -13

Combine like terms: 7 + -13 = -6
3m = -6

Divide each side by '3'.
m = -2

Simplifying
m = -2

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