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f(-6)=-3(-6)-4(-6)+8
We move all terms to the left:
f(-6)-(-3(-6)-4(-6)+8)=0
We add all the numbers together, and all the variables
f(-6)-50=0
We multiply parentheses
-6f-50=0
We move all terms containing f to the left, all other terms to the right
-6f=50
f=50/-6
f=-8+1/3
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