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-10m+100=-90m-100
We move all terms to the left:
-10m+100-(-90m-100)=0
We get rid of parentheses
-10m+90m+100+100=0
We add all the numbers together, and all the variables
80m+200=0
We move all terms containing m to the left, all other terms to the right
80m=-200
m=-200/80
m=-2+1/2
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