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30(18-30y)+10y=140
We move all terms to the left:
30(18-30y)+10y-(140)=0
We add all the numbers together, and all the variables
30(-30y+18)+10y-140=0
We add all the numbers together, and all the variables
10y+30(-30y+18)-140=0
We multiply parentheses
10y-900y+540-140=0
We add all the numbers together, and all the variables
-890y+400=0
We move all terms containing y to the left, all other terms to the right
-890y=-400
y=-400/-890
y=40/89
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