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2=m.2-7
We move all terms to the left:
2-(m.2-7)=0
We get rid of parentheses
-m.2+7+2=0
We add all the numbers together, and all the variables
-m.2+9=0
We move all terms containing m to the left, all other terms to the right
-m.2=-9
m=-9/1
m=-9
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