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y+(2y-20)=180
We move all terms to the left:
y+(2y-20)-(180)=0
We get rid of parentheses
y+2y-20-180=0
We add all the numbers together, and all the variables
3y-200=0
We move all terms containing y to the left, all other terms to the right
3y=200
y=200/3
y=66+2/3
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