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580+30y=700+20y
We move all terms to the left:
580+30y-(700+20y)=0
We add all the numbers together, and all the variables
30y-(20y+700)+580=0
We get rid of parentheses
30y-20y-700+580=0
We add all the numbers together, and all the variables
10y-120=0
We move all terms containing y to the left, all other terms to the right
10y=120
y=120/10
y=12
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