13+4m=21

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Solution for 13+4m=21 equation: 


Simplifying
13 + 4m = 21

Solving
13 + 4m = 21

Solving for variable 'm'.

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

Add '-13' to each side of the equation.
13 + -13 + 4m = 21 + -13

Combine like terms: 13 + -13 = 0
0 + 4m = 21 + -13
4m = 21 + -13

Combine like terms: 21 + -13 = 8
4m = 8

Divide each side by '4'.
m = 2

Simplifying
m = 2

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