F(x+4)=3x-9

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Solution for F(x+4)=3x-9 equation: 



(F+4)=3F-9

We move all terms to the left:

(F+4)-(3F-9)=0

We get rid of parentheses

F-3F+4+9=0

We add all the numbers together, and all the variables

-2F+13=0

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

-2F=-13

F=-13/-2

F=6+1/2

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