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16-y/7=21
We move all terms to the left:
16-y/7-(21)=0
We add all the numbers together, and all the variables
-y/7-5=0
We multiply all the terms by the denominator
-y-5*7=0
We add all the numbers together, and all the variables
-1y-35=0
We move all terms containing y to the left, all other terms to the right
-y=35
y=35/-1
y=-35
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