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20y+10(70-y)=1100
We move all terms to the left:
20y+10(70-y)-(1100)=0
We add all the numbers together, and all the variables
20y+10(-1y+70)-1100=0
We multiply parentheses
20y-10y+700-1100=0
We add all the numbers together, and all the variables
10y-400=0
We move all terms containing y to the left, all other terms to the right
10y=400
y=400/10
y=40
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