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-15=-4m+5=m
We move all terms to the left:
-15-(-4m+5)=0
We get rid of parentheses
4m-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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