F(x)=-3x+7=-20

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Solution for F(x)=-3x+7=-20 equation: 



(F)=-3F+7=-20

We move all terms to the left:

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

We get rid of parentheses

F+3F-7=0

We add all the numbers together, and all the variables

4F-7=0

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

4F=7

F=7/4

F=1+3/4

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