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10y-9=3+8y
We move all terms to the left:
10y-9-(3+8y)=0
We add all the numbers together, and all the variables
10y-(8y+3)-9=0
We get rid of parentheses
10y-8y-3-9=0
We add all the numbers together, and all the variables
2y-12=0
We move all terms containing y to the left, all other terms to the right
2y=12
y=12/2
y=6
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