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(3y-21)=y-1/2
We move all terms to the left:
(3y-21)-(y-1/2)=0
We add all the numbers together, and all the variables
(3y-21)-(+y-1/2)=0
We get rid of parentheses
3y-y-21+1/2=0
We multiply all the terms by the denominator
3y*2-y*2+1-21*2=0
We add all the numbers together, and all the variables
3y*2-y*2-41=0
Wy multiply elements
6y-2y-41=0
We add all the numbers together, and all the variables
4y-41=0
We move all terms containing y to the left, all other terms to the right
4y=41
y=41/4
y=10+1/4
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