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f(-3)=2(-3)^4+-5(-3)^3+3(-3)-1
We move all terms to the left:
f(-3)-(2(-3)^4+-5(-3)^3+3(-3)-1)=0
We add all the numbers together, and all the variables
f(-3)-287=0
We multiply parentheses
-3f-287=0
We move all terms containing f to the left, all other terms to the right
-3f=287
f=287/-3
f=-95+2/3
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