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5y-21=-3y+19
We move all terms to the left:
5y-21-(-3y+19)=0
We get rid of parentheses
5y+3y-19-21=0
We add all the numbers together, and all the variables
8y-40=0
We move all terms containing y to the left, all other terms to the right
8y=40
y=40/8
y=5
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