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21-2y/5=4-y
We move all terms to the left:
21-2y/5-(4-y)=0
We add all the numbers together, and all the variables
-2y/5-(-1y+4)+21=0
We get rid of parentheses
-2y/5+1y-4+21=0
We multiply all the terms by the denominator
-2y+1y*5-4*5+21*5=0
We add all the numbers together, and all the variables
-2y+1y*5+85=0
Wy multiply elements
-2y+5y+85=0
We add all the numbers together, and all the variables
3y+85=0
We move all terms containing y to the left, all other terms to the right
3y=-85
y=-85/3
y=-28+1/3
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