5m+7-9=21

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Solution for 5m+7-9=21 equation: 


Simplifying
5m + 7 + -9 = 21

Reorder the terms:
7 + -9 + 5m = 21

Combine like terms: 7 + -9 = -2
-2 + 5m = 21

Solving
-2 + 5m = 21

Solving for variable 'm'.

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

Add '2' to each side of the equation.
-2 + 2 + 5m = 21 + 2

Combine like terms: -2 + 2 = 0
0 + 5m = 21 + 2
5m = 21 + 2

Combine like terms: 21 + 2 = 23
5m = 23

Divide each side by '5'.
m = 4.6

Simplifying
m = 4.6

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