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720=n/2(21+3)
We move all terms to the left:
720-(n/2(21+3))=0
We add all the numbers together, and all the variables
-(n/224)+720=0
We get rid of parentheses
-n/224+720=0
We multiply all the terms by the denominator
-n+720*224=0
We add all the numbers together, and all the variables
-1n+161280=0
We move all terms containing n to the left, all other terms to the right
-n=-161280
n=-161280/-1
n=+161280
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