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