F(x)=5x-21

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Solution for F(x)=5x-21 equation: 



(F)=5F-21

We move all terms to the left:

(F)-(5F-21)=0

We get rid of parentheses

F-5F+21=0

We add all the numbers together, and all the variables

-4F+21=0

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

-4F=-21

F=-21/-4

F=5+1/4

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