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f(-8)=6(-8)-3
We move all terms to the left:
f(-8)-(6(-8)-3)=0
We add all the numbers together, and all the variables
f(-8)+51=0
We multiply parentheses
-8f+51=0
We move all terms containing f to the left, all other terms to the right
-8f=-51
f=-51/-8
f=6+3/8
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