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f(-11)=3-5(-11)
We move all terms to the left:
f(-11)-(3-5(-11))=0
We add all the numbers together, and all the variables
f(-11)-58=0
We multiply parentheses
-11f-58=0
We move all terms containing f to the left, all other terms to the right
-11f=58
f=58/-11
f=-5+3/11
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