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12y-45=4y+43
We move all terms to the left:
12y-45-(4y+43)=0
We get rid of parentheses
12y-4y-43-45=0
We add all the numbers together, and all the variables
8y-88=0
We move all terms containing y to the left, all other terms to the right
8y=88
y=88/8
y=11
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