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(6m+6)+(4m-6)=90
We move all terms to the left:
(6m+6)+(4m-6)-(90)=0
We get rid of parentheses
6m+4m+6-6-90=0
We add all the numbers together, and all the variables
10m-90=0
We move all terms containing m to the left, all other terms to the right
10m=90
m=90/10
m=9
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