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6(2y+9)=102
We move all terms to the left:
6(2y+9)-(102)=0
We multiply parentheses
12y+54-102=0
We add all the numbers together, and all the variables
12y-48=0
We move all terms containing y to the left, all other terms to the right
12y=48
y=48/12
y=4
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