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5y+(20*5)=3y+(40*3)
We move all terms to the left:
5y+(20*5)-(3y+(40*3))=0
We add all the numbers together, and all the variables
5y-(3y+120)+100=0
We get rid of parentheses
5y-3y-120+100=0
We add all the numbers together, and all the variables
2y-20=0
We move all terms containing y to the left, all other terms to the right
2y=20
y=20/2
y=10
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