F(-8)=-9x-21

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Solution for F(-8)=-9x-21 equation: 



(-8)=-9F-21

We move all terms to the left:

(-8)-(-9F-21)=0

We add all the numbers together, and all the variables

-(-9F-21)-8=0

We get rid of parentheses

9F+21-8=0

We add all the numbers together, and all the variables

9F+13=0

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

9F=-13

F=-13/9

F=-1+4/9

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