F(15)=3x-12

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Solution for F(15)=3x-12 equation: 



(15)=3F-12

We move all terms to the left:

(15)-(3F-12)=0

We get rid of parentheses

-3F+12+15=0

We add all the numbers together, and all the variables

-3F+27=0

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

-3F=-27

F=-27/-3

F=+9

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