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21=3+4n=5n
We move all terms to the left:
21-(3+4n)=0
We add all the numbers together, and all the variables
-(4n+3)+21=0
We get rid of parentheses
-4n-3+21=0
We add all the numbers together, and all the variables
-4n+18=0
We move all terms containing n to the left, all other terms to the right
-4n=-18
n=-18/-4
n=4+1/2
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