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[tex] ({2y})^{3} + 3x = [/tex]
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[tex]x = 5 \: \: \: \: and \: \: \: y = 3[/tex]
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[tex] ({2 \times 3})^{3} + 3(5) = [/tex]
[tex] {6}^{3} + 15 = [/tex]
[tex]216 + 15 = 231[/tex]
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