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2(6y+1)=21y+13
We move all terms to the left:
2(6y+1)-(21y+13)=0
We multiply parentheses
12y-(21y+13)+2=0
We get rid of parentheses
12y-21y-13+2=0
We add all the numbers together, and all the variables
-9y-11=0
We move all terms containing y to the left, all other terms to the right
-9y=11
y=11/-9
y=-1+2/9
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