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6+(y)/(5)=21
We move all terms to the left:
6+(y)/(5)-(21)=0
We add all the numbers together, and all the variables
y/5-15=0
We multiply all the terms by the denominator
y-15*5=0
We add all the numbers together, and all the variables
y-75=0
We move all terms containing y to the left, all other terms to the right
y=75
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