At which temperature the Centigrade and Fahrenheit scales

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As C/5 = F - 32/9
if C = F = X° then X°/5 = X° - 32/9
⇒ 9X° = 5X° - 32 x 5
⇒ 4X° = - 32 x 5
⇒ X° = - 32 x 5/4 = - 40°