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21=y/5+19
We move all terms to the left:
21-(y/5+19)=0
We get rid of parentheses
-y/5-19+21=0
We multiply all the terms by the denominator
-y-19*5+21*5=0
We add all the numbers together, and all the variables
-1y+10=0
We move all terms containing y to the left, all other terms to the right
-y=-10
y=-10/-1
y=+10
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