F(7)=-5x+21

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Solution for F(7)=-5x+21 equation: 



(7)=-5F+21

We move all terms to the left:

(7)-(-5F+21)=0

We get rid of parentheses

5F-21+7=0

We add all the numbers together, and all the variables

5F-14=0

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

5F=14

F=14/5

F=2+4/5

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