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80=105-5m
We move all terms to the left:
80-(105-5m)=0
We add all the numbers together, and all the variables
-(-5m+105)+80=0
We get rid of parentheses
5m-105+80=0
We add all the numbers together, and all the variables
5m-25=0
We move all terms containing m to the left, all other terms to the right
5m=25
m=25/5
m=5
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