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6.9=0.3n
We move all terms to the left:
6.9-(0.3n)=0
We add all the numbers together, and all the variables
-(+0.3n)+6.9=0
We get rid of parentheses
-0.3n+6.9=0
We move all terms containing n to the left, all other terms to the right
-0.3n=-6.9
n=-6.9/-0.3
n=23+8.8817841970013E-16/0.3
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