f(-2)=6(-2)^2-4

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Solution for f(-2)=6(-2)^2-4 equation: 



f(-2)=6(-2)^2-4

We move all terms to the left:

f(-2)-(6(-2)^2-4)=0

We add all the numbers together, and all the variables

f(-2)-20=0

We multiply parentheses

-2f-20=0

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

-2f=20

f=20/-2

f=-10

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