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