[tex]2x \: . \: 5x \: . \: 80x \div 5 = 20 \\ \to \frac{800 {x}^{3} }{5} = 20 \\ \to 800{x}^{3} = 100 \\ \to {x}^{3} = \frac{1}{8} \\ \\ \to x = \sqrt[3]{ \frac{1}{8} } \\ \to x = \green{\frac{1}{2}}[/tex]
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[tex]2x \: . \: 5x \: . \: 80x \div 5 = 20 \\ \to \frac{800 {x}^{3} }{5} = 20 \\ \to 800{x}^{3} = 100 \\ \to {x}^{3} = \frac{1}{8} \\ \\ \to x = \sqrt[3]{ \frac{1}{8} } \\ \to x = \green{\frac{1}{2}}[/tex]