F(-3)=2x+20

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Solution for F(-3)=2x+20 equation: 



(-3)=2F+20

We move all terms to the left:

(-3)-(2F+20)=0

We add all the numbers together, and all the variables

-(2F+20)-3=0

We get rid of parentheses

-2F-20-3=0

We add all the numbers together, and all the variables

-2F-23=0

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

-2F=23

F=23/-2

F=-11+1/2

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