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-20+2y=18-3y+12
We move all terms to the left:
-20+2y-(18-3y+12)=0
We add all the numbers together, and all the variables
2y-(-3y+30)-20=0
We get rid of parentheses
2y+3y-30-20=0
We add all the numbers together, and all the variables
5y-50=0
We move all terms containing y to the left, all other terms to the right
5y=50
y=50/5
y=10
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