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9=109-10y
We move all terms to the left:
9-(109-10y)=0
We add all the numbers together, and all the variables
-(-10y+109)+9=0
We get rid of parentheses
10y-109+9=0
We add all the numbers together, and all the variables
10y-100=0
We move all terms containing y to the left, all other terms to the right
10y=100
y=100/10
y=10
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