13=m+21

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Solution for 13=m+21 equation:


Simplifying
13 = m + 21

Reorder the terms:
13 = 21 + m

Solving
13 = 21 + m

Solving for variable 'm'.

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

Add '-1m' to each side of the equation.
13 + -1m = 21 + m + -1m

Combine like terms: m + -1m = 0
13 + -1m = 21 + 0
13 + -1m = 21

Add '-13' to each side of the equation.
13 + -13 + -1m = 21 + -13

Combine like terms: 13 + -13 = 0
0 + -1m = 21 + -13
-1m = 21 + -13

Combine like terms: 21 + -13 = 8
-1m = 8

Divide each side by '-1'.
m = -8

Simplifying
m = -8

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