SOLUTION: please solve this:3^(x+1)+3^(x-2)+3^(x-1)+3^(x+2)=336

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Question 891342: please solve this:3^(x+1)+3^(x-2)+3^(x-1)+3^(x+2)=336
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please solve this:3^(x+1)+3^(x-2)+3^(x-1)+3^(x+2)=336

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