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-15=-4m+5.m
We move all terms to the left:
-15-(-4m+5.m)=0
We add all the numbers together, and all the variables
-(+m)-15=0
We get rid of parentheses
-m-15=0
We add all the numbers together, and all the variables
-1m-15=0
We move all terms containing m to the left, all other terms to the right
-m=15
m=15/-1
m=-15
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