F(-9)=-2x+7

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Solution for F(-9)=-2x+7 equation: 



(-9)=-2F+7

We move all terms to the left:

(-9)-(-2F+7)=0

We add all the numbers together, and all the variables

-(-2F+7)-9=0

We get rid of parentheses

2F-7-9=0

We add all the numbers together, and all the variables

2F-16=0

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

2F=16

F=16/2

F=8

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