4m=9m-20 equals what

asked Sep 2, 2015 74.8k views

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4m=9m-20
0=5m-20 (subtract 4m to both sides)
5m=20 (add 20 to both sides)
m=4 (divide by 5 to both sides)

Sun Junwen answered Sep 3, 2015

8.8k points

3 votes

4m=9m-20

You need to get "m" all on one side.

Take -9m from each side

-5m=-20

Divide -20 by -5m

-20÷-5=4

m=4

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