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-30=5y-15y
We move all terms to the left:
-30-(5y-15y)=0
We add all the numbers together, and all the variables
-(-10y)-30=0
We get rid of parentheses
10y-30=0
We move all terms containing y to the left, all other terms to the right
10y=30
y=30/10
y=3
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