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10y+9=5y+39
We move all terms to the left:
10y+9-(5y+39)=0
We get rid of parentheses
10y-5y-39+9=0
We add all the numbers together, and all the variables
5y-30=0
We move all terms containing y to the left, all other terms to the right
5y=30
y=30/5
y=6
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