F(-4)=-3x-12

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Solution for F(-4)=-3x-12 equation: 



(-4)=-3F-12

We move all terms to the left:

(-4)-(-3F-12)=0

We add all the numbers together, and all the variables

-(-3F-12)-4=0

We get rid of parentheses

3F+12-4=0

We add all the numbers together, and all the variables

3F+8=0

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

3F=-8

F=-8/3

F=-2+2/3

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