f(-7)=3(-7)^2-4(-7)-8

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Solution for f(-7)=3(-7)^2-4(-7)-8 equation: 



f(-7)=3(-7)^2-4(-7)-8

We move all terms to the left:

f(-7)-(3(-7)^2-4(-7)-8)=0

We add all the numbers together, and all the variables

f(-7)-167=0

We multiply parentheses

-7f-167=0

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

-7f=167

f=167/-7

f=-23+6/7

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