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21y-6=4y+3
We move all terms to the left:
21y-6-(4y+3)=0
We get rid of parentheses
21y-4y-3-6=0
We add all the numbers together, and all the variables
17y-9=0
We move all terms containing y to the left, all other terms to the right
17y=9
y=9/17
y=9/17
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