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7(2y+1)=77
We move all terms to the left:
7(2y+1)-(77)=0
We multiply parentheses
14y+7-77=0
We add all the numbers together, and all the variables
14y-70=0
We move all terms containing y to the left, all other terms to the right
14y=70
y=70/14
y=5
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