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7=2y+3=15
We move all terms to the left:
7-(2y+3)=0
We get rid of parentheses
-2y-3+7=0
We add all the numbers together, and all the variables
-2y+4=0
We move all terms containing y to the left, all other terms to the right
-2y=-4
y=-4/-2
y=+2
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