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3y+21=y/5
We move all terms to the left:
3y+21-(y/5)=0
We add all the numbers together, and all the variables
3y-(+y/5)+21=0
We get rid of parentheses
3y-y/5+21=0
We multiply all the terms by the denominator
3y*5-y+21*5=0
We add all the numbers together, and all the variables
-1y+3y*5+105=0
Wy multiply elements
-1y+15y+105=0
We add all the numbers together, and all the variables
14y+105=0
We move all terms containing y to the left, all other terms to the right
14y=-105
y=-105/14
y=-7+1/2
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