F(n)=3n-5n-9

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Solution for F(n)=3n-5n-9 equation: 



(F)=3F-5F-9

We move all terms to the left:

(F)-(3F-5F-9)=0

We add all the numbers together, and all the variables

F-(-2F-9)=0

We get rid of parentheses

F+2F+9=0

We add all the numbers together, and all the variables

3F+9=0

We move all terms containing F to the left, all other terms to the right

3F=-9

F=-9/3

F=-3

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