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 #1
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x = 1/7.

 Dec 2, 2020
 #2
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incorrect

 Dec 2, 2020
 #3
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Interesting problem. I will denote the cube root of something as cbrt. Then you have cbrt((2x+3)/4)=2cbrt((x+3)/4). Now just cube both sides and you have an easy linear equation. The solution is x=-7/2, your answer.

 Dec 2, 2020

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