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7y+8=16y-91
We move all terms to the left:
7y+8-(16y-91)=0
We get rid of parentheses
7y-16y+91+8=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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