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100=1+9y
We move all terms to the left:
100-(1+9y)=0
We add all the numbers together, and all the variables
-(9y+1)+100=0
We get rid of parentheses
-9y-1+100=0
We add all the numbers together, and all the variables
-9y+99=0
We move all terms containing y to the left, all other terms to the right
-9y=-99
y=-99/-9
y=+11
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