F(x)=x-x-7

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



(F)=F-F-7

We move all terms to the left:

(F)-(F-F-7)=0

We add all the numbers together, and all the variables

F-(-7)=0

We add all the numbers together, and all the variables

F+7=0

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

F=-7

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