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

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



(F)=-(20+3F)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(-(3F+20)), so:

-(3F+20)

We get rid of parentheses

-3F-20

Back to the equation:

-(-3F-20)



We get rid of parentheses

F+3F+20=0

We add all the numbers together, and all the variables

4F+20=0

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

4F=-20

F=-20/4

F=-5

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