Find the sum of the following expressions: \[ a x^{3}-4 b x^{2}+c x ; 3 b x^{2}-2 c x-d ; b x^{2...

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Find the sum of the following expressions:
\[
a x^{3}-4 b x^{2}+c x ; 3 b x^{2}-2 c x-d ; b x^{2}+2 d ; 2 a x^{3}+d
\]
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