F(31)=15-4x

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Solution for F(31)=15-4x equation: 



(31)=15-4F

We move all terms to the left:

(31)-(15-4F)=0

We add all the numbers together, and all the variables

-(-4F+15)+31=0

We get rid of parentheses

4F-15+31=0

We add all the numbers together, and all the variables

4F+16=0

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

4F=-16

F=-16/4

F=-4

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