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5(n-6)=21
We move all terms to the left:
5(n-6)-(21)=0
We multiply parentheses
5n-30-21=0
We add all the numbers together, and all the variables
5n-51=0
We move all terms containing n to the left, all other terms to the right
5n=51
n=51/5
n=10+1/5
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