f(-2)=-15

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Solution for f(-2)=-15 equation: 



f(-2)=-15

We move all terms to the left:

f(-2)-(-15)=0

We add all the numbers together, and all the variables

f(-2)+15=0

We multiply parentheses

-2f+15=0

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

-2f=-15

f=-15/-2

f=7+1/2

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