f(-3)=6(-3)^2-12

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Solution for f(-3)=6(-3)^2-12 equation: 



f(-3)=6(-3)^2-12

We move all terms to the left:

f(-3)-(6(-3)^2-12)=0

We add all the numbers together, and all the variables

f(-3)-42=0

We multiply parentheses

-3f-42=0

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

-3f=42

f=42/-3

f=-14

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