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f(-5)=-3-12(-5)
We move all terms to the left:
f(-5)-(-3-12(-5))=0
We add all the numbers together, and all the variables
f(-5)-57=0
We multiply parentheses
-5f-57=0
We move all terms containing f to the left, all other terms to the right
-5f=57
f=57/-5
f=-11+2/5
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