F(7)=3-x

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Solution for F(7)=3-x equation: 



(7)=3-F

We move all terms to the left:

(7)-(3-F)=0

We add all the numbers together, and all the variables

-(-1F+3)+7=0

We get rid of parentheses

1F-3+7=0

We add all the numbers together, and all the variables

F+4=0

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

F=-4

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