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(7y+2)+(2y+9)=13y-21
We move all terms to the left:
(7y+2)+(2y+9)-(13y-21)=0
We get rid of parentheses
7y+2y-13y+2+9+21=0
We add all the numbers together, and all the variables
-4y+32=0
We move all terms containing y to the left, all other terms to the right
-4y=-32
y=-32/-4
y=+8
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