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.9(n-5)=9
We move all terms to the left:
.9(n-5)-(9)=0
We multiply parentheses
0.9n-4.5-9=0
We add all the numbers together, and all the variables
0.9n-13.5=0
We move all terms containing n to the left, all other terms to the right
0.9n=13.5
n=13.5/0.9
n=15
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