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0.9(n-3.1)=6
We move all terms to the left:
0.9(n-3.1)-(6)=0
We multiply parentheses
0.9n-2.79-6=0
We add all the numbers together, and all the variables
0.9n-8.79=0
We move all terms containing n to the left, all other terms to the right
0.9n=8.79
n=8.79/0.9
n=9+0.69/0.9
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