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f(-3)=10(-3)+3(-3)^2
We move all terms to the left:
f(-3)-(10(-3)+3(-3)^2)=0
We add all the numbers together, and all the variables
f(-3)+3=0
We multiply parentheses
-3f+3=0
We move all terms containing f to the left, all other terms to the right
-3f=-3
f=-3/-3
f=1
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