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16=n/4+21
We move all terms to the left:
16-(n/4+21)=0
We get rid of parentheses
-n/4-21+16=0
We multiply all the terms by the denominator
-n-21*4+16*4=0
We add all the numbers together, and all the variables
-1n-20=0
We move all terms containing n to the left, all other terms to the right
-n=20
n=20/-1
n=-20
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