F(3)=-2x+15

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Solution for F(3)=-2x+15 equation: 



(3)=-2F+15

We move all terms to the left:

(3)-(-2F+15)=0

We get rid of parentheses

2F-15+3=0

We add all the numbers together, and all the variables

2F-12=0

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

2F=12

F=12/2

F=6

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