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3/7=1-0.12n
We move all terms to the left:
3/7-(1-0.12n)=0
We add all the numbers together, and all the variables
-(-0.12n+1)+3/7=0
We get rid of parentheses
0.12n-1+3/7=0
We multiply all the terms by the denominator
(0.12n)*7+3-1*7=0
We add all the numbers together, and all the variables
(+0.12n)*7+3-1*7=0
We add all the numbers together, and all the variables
(+0.12n)*7-4=0
We multiply parentheses
0n-4=0
We add all the numbers together, and all the variables
n-4=0
We move all terms containing n to the left, all other terms to the right
n=4
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