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4(y+13)=15y-21
We move all terms to the left:
4(y+13)-(15y-21)=0
We multiply parentheses
4y-(15y-21)+52=0
We get rid of parentheses
4y-15y+21+52=0
We add all the numbers together, and all the variables
-11y+73=0
We move all terms containing y to the left, all other terms to the right
-11y=-73
y=-73/-11
y=6+7/11
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