F(-7)=-3x-(-15)

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Solution for F(-7)=-3x-(-15) equation: 



(-7)=-3F-(-15)

We move all terms to the left:

(-7)-(-3F-(-15))=0

We add all the numbers together, and all the variables

-(-3F-(-15))-7=0



We calculate terms in parentheses: -(-3F-(-15)), so:

-3F-(-15)

We add all the numbers together, and all the variables

-3F+15

Back to the equation:

-(-3F+15)



We get rid of parentheses

3F-15-7=0

We add all the numbers together, and all the variables

3F-22=0

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

3F=22

F=22/3

F=7+1/3

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