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2.5(10-y)+27.5y=250
We move all terms to the left:
2.5(10-y)+27.5y-(250)=0
We add all the numbers together, and all the variables
2.5(-1y+10)+27.5y-250=0
We add all the numbers together, and all the variables
27.5y+2.5(-1y+10)-250=0
We multiply parentheses
27.5y-2.5y+25-250=0
We add all the numbers together, and all the variables
25y-225=0
We move all terms containing y to the left, all other terms to the right
25y=225
y=225/25
y=9
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