F(3)=-5x-x+20

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Solution for F(3)=-5x-x+20 equation: 



(3)=-5F-F+20

We move all terms to the left:

(3)-(-5F-F+20)=0

We add all the numbers together, and all the variables

-(-6F+20)+3=0

We get rid of parentheses

6F-20+3=0

We add all the numbers together, and all the variables

6F-17=0

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

6F=17

F=17/6

F=2+5/6

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