f(x)=7x+28x+21

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Solution for f(x)=7x+28x+21 equation: 



(F)=7F+28F+21

We move all terms to the left:

(F)-(7F+28F+21)=0

We add all the numbers together, and all the variables

F-(35F+21)=0

We get rid of parentheses

F-35F-21=0

We add all the numbers together, and all the variables

-34F-21=0

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

-34F=21

F=21/-34

F=-21/34

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