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7y-99=5y+51
We move all terms to the left:
7y-99-(5y+51)=0
We get rid of parentheses
7y-5y-51-99=0
We add all the numbers together, and all the variables
2y-150=0
We move all terms containing y to the left, all other terms to the right
2y=150
y=150/2
y=75
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