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simplify d/dx(4x+2(4x+5(4x+7(4x)^(1/5))^(1/5))^(1/5))^(1/5)
simplify d/dx(4x+2(4x+5(4x+7(4x)^(1/5))^(1/5))^(1/5))^(1/5)
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