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60m-15(4-8m)+20=0
We add all the numbers together, and all the variables
60m-15(-8m+4)+20=0
We multiply parentheses
60m+120m-60+20=0
We add all the numbers together, and all the variables
180m-40=0
We move all terms containing m to the left, all other terms to the right
180m=40
m=40/180
m=2/9
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