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12.9=n/19
We move all terms to the left:
12.9-(n/19)=0
We add all the numbers together, and all the variables
-(+n/19)+12.9=0
We get rid of parentheses
-n/19+12.9=0
We multiply all the terms by the denominator
-n+(12.9)*19=0
We add all the numbers together, and all the variables
-1n+245.1=0
We move all terms containing n to the left, all other terms to the right
-n=-245.1
n=-245.1/-1
n=245+0.099999999999994/1
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