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(n)(.13)(.87)=10
We move all terms to the left:
(n)(.13)(.87)-(10)=0
We add all the numbers together, and all the variables
n(0.13)(0.87)-10=0
We multiply parentheses ..
n()-10=0
We move all terms containing n to the left, all other terms to the right
n()=10
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