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8.4=n/12-8.9
We move all terms to the left:
8.4-(n/12-8.9)=0
We get rid of parentheses
-n/12+8.9+8.4=0
We multiply all the terms by the denominator
-n+(8.9)*12+(8.4)*12=0
We add all the numbers together, and all the variables
-1n+207.6=0
We move all terms containing n to the left, all other terms to the right
-n=-207.6
n=-207.6/-1
n=207+0.59999999999999/1
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