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17=2n-21
We move all terms to the left:
17-(2n-21)=0
We get rid of parentheses
-2n+21+17=0
We add all the numbers together, and all the variables
-2n+38=0
We move all terms containing n to the left, all other terms to the right
-2n=-38
n=-38/-2
n=+19
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