F(x)=3x+21

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Solution for F(x)=3x+21 equation: 



(F)=3F+21

We move all terms to the left:

(F)-(3F+21)=0

We get rid of parentheses

F-3F-21=0

We add all the numbers together, and all the variables

-2F-21=0

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

-2F=21

F=21/-2

F=-10+1/2

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