F(-3)=12-3x

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



(-3)=12-3F

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3F-12-3=0

We add all the numbers together, and all the variables

3F-15=0

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

3F=15

F=15/3

F=5

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