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9y+68=21y-100
We move all terms to the left:
9y+68-(21y-100)=0
We get rid of parentheses
9y-21y+100+68=0
We add all the numbers together, and all the variables
-12y+168=0
We move all terms containing y to the left, all other terms to the right
-12y=-168
y=-168/-12
y=+14
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