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10y-1=8y-9
We move all terms to the left:
10y-1-(8y-9)=0
We get rid of parentheses
10y-8y+9-1=0
We add all the numbers together, and all the variables
2y+8=0
We move all terms containing y to the left, all other terms to the right
2y=-8
y=-8/2
y=-4
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