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5y+(2y-7)-12=4
We move all terms to the left:
5y+(2y-7)-12-(4)=0
We add all the numbers together, and all the variables
5y+(2y-7)-16=0
We get rid of parentheses
5y+2y-7-16=0
We add all the numbers together, and all the variables
7y-23=0
We move all terms containing y to the left, all other terms to the right
7y=23
y=23/7
y=3+2/7
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