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21=6y-3
We move all terms to the left:
21-(6y-3)=0
We get rid of parentheses
-6y+3+21=0
We add all the numbers together, and all the variables
-6y+24=0
We move all terms containing y to the left, all other terms to the right
-6y=-24
y=-24/-6
y=+4
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