f(-3)=-3(-3)^2-3(-3)

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Solution for f(-3)=-3(-3)^2-3(-3) equation: 



f(-3)=-3(-3)^2-3(-3)

We move all terms to the left:

f(-3)-(-3(-3)^2-3(-3))=0

We add all the numbers together, and all the variables

f(-3)+18=0

We multiply parentheses

-3f+18=0

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

-3f=-18

f=-18/-3

f=+6

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