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30=3y+15
We move all terms to the left:
30-(3y+15)=0
We get rid of parentheses
-3y-15+30=0
We add all the numbers together, and all the variables
-3y+15=0
We move all terms containing y to the left, all other terms to the right
-3y=-15
y=-15/-3
y=+5
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