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5n-9(1-5n)=0
We add all the numbers together, and all the variables
5n-9(-5n+1)=0
We multiply parentheses
5n+45n-9=0
We add all the numbers together, and all the variables
50n-9=0
We move all terms containing n to the left, all other terms to the right
50n=9
n=9/50
n=9/50
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