F(20)=7x-20

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Solution for F(20)=7x-20 equation: 



(20)=7F-20

We move all terms to the left:

(20)-(7F-20)=0

We get rid of parentheses

-7F+20+20=0

We add all the numbers together, and all the variables

-7F+40=0

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

-7F=-40

F=-40/-7

F=5+5/7

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