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15-3m=m-5
We move all terms to the left:
15-3m-(m-5)=0
We get rid of parentheses
-3m-m+5+15=0
We add all the numbers together, and all the variables
-4m+20=0
We move all terms containing m to the left, all other terms to the right
-4m=-20
m=-20/-4
m=+5
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