4n+9-8m=21

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Solution for 4n+9-8m=21 equation:


Simplifying
4n + 9 + -8m = 21

Reorder the terms:
9 + -8m + 4n = 21

Solving
9 + -8m + 4n = 21

Solving for variable 'm'.

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

Add '-9' to each side of the equation.
9 + -8m + -9 + 4n = 21 + -9

Reorder the terms:
9 + -9 + -8m + 4n = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -8m + 4n = 21 + -9
-8m + 4n = 21 + -9

Combine like terms: 21 + -9 = 12
-8m + 4n = 12

Add '-4n' to each side of the equation.
-8m + 4n + -4n = 12 + -4n

Combine like terms: 4n + -4n = 0
-8m + 0 = 12 + -4n
-8m = 12 + -4n

Divide each side by '-8'.
m = -1.5 + 0.5n

Simplifying
m = -1.5 + 0.5n

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