F(x)=78+3.9x

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Solution for F(x)=78+3.9x equation: 



(F)=78+3.9F

We move all terms to the left:

(F)-(78+3.9F)=0

We add all the numbers together, and all the variables

F-(3.9F+78)=0

We get rid of parentheses

F-3.9F-78=0

We add all the numbers together, and all the variables

-2.9F-78=0

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

-2.9F=78

F=78/-2.9

F=-26+1/1.1153846153846

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