F(x)=-4x+50=80

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Solution for F(x)=-4x+50=80 equation: 



(F)=-4F+50=80

We move all terms to the left:

(F)-(-4F+50)=0

We get rid of parentheses

F+4F-50=0

We add all the numbers together, and all the variables

5F-50=0

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

5F=50

F=50/5

F=10

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