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-21=m-1+4m
We move all terms to the left:
-21-(m-1+4m)=0
We add all the numbers together, and all the variables
-(5m-1)-21=0
We get rid of parentheses
-5m+1-21=0
We add all the numbers together, and all the variables
-5m-20=0
We move all terms containing m to the left, all other terms to the right
-5m=20
m=20/-5
m=-4
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