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f(-5)=3(-5)-6
We move all terms to the left:
f(-5)-(3(-5)-6)=0
We add all the numbers together, and all the variables
f(-5)+21=0
We multiply parentheses
-5f+21=0
We move all terms containing f to the left, all other terms to the right
-5f=-21
f=-21/-5
f=4+1/5
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