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4m/10-5m/10=40
We move all terms to the left:
4m/10-5m/10-(40)=0
We multiply all the terms by the denominator
4m-5m-40*10=0
We add all the numbers together, and all the variables
-1m-400=0
We move all terms containing m to the left, all other terms to the right
-m=400
m=400/-1
m=-400
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