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f(-6)=4^2(-6)-3(-6)+2
We move all terms to the left:
f(-6)-(4^2(-6)-3(-6)+2)=0
We add all the numbers together, and all the variables
f(-6)+76=0
We multiply parentheses
-6f+76=0
We move all terms containing f to the left, all other terms to the right
-6f=-76
f=-76/-6
f=12+2/3
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