F(21)=-2x-5=21

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Solution for F(21)=-2x-5=21 equation: 



(21)=-2F-5=21

We move all terms to the left:

(21)-(-2F-5)=0

We get rid of parentheses

2F+5+21=0

We add all the numbers together, and all the variables

2F+26=0

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

2F=-26

F=-26/2

F=-13

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