f(-2)=-9

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Solution for f(-2)=-9 equation: 



f(-2)=-9

We move all terms to the left:

f(-2)-(-9)=0

We add all the numbers together, and all the variables

f(-2)+9=0

We multiply parentheses

-2f+9=0

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

-2f=-9

f=-9/-2

f=4+1/2

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