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f(-3)=10(-3)-3
We move all terms to the left:
f(-3)-(10(-3)-3)=0
We add all the numbers together, and all the variables
f(-3)+33=0
We multiply parentheses
-3f+33=0
We move all terms containing f to the left, all other terms to the right
-3f=-33
f=-33/-3
f=+11
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