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20-5n=2n+6
We move all terms to the left:
20-5n-(2n+6)=0
We get rid of parentheses
-5n-2n-6+20=0
We add all the numbers together, and all the variables
-7n+14=0
We move all terms containing n to the left, all other terms to the right
-7n=-14
n=-14/-7
n=+2
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