21=31-4m

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Solution for 21=31-4m equation:


Simplifying
21 = 31 + -4m

Solving
21 = 31 + -4m

Solving for variable 'm'.

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

Add '4m' to each side of the equation.
21 + 4m = 31 + -4m + 4m

Combine like terms: -4m + 4m = 0
21 + 4m = 31 + 0
21 + 4m = 31

Add '-21' to each side of the equation.
21 + -21 + 4m = 31 + -21

Combine like terms: 21 + -21 = 0
0 + 4m = 31 + -21
4m = 31 + -21

Combine like terms: 31 + -21 = 10
4m = 10

Divide each side by '4'.
m = 2.5

Simplifying
m = 2.5

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