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x3-20=7
x3=27
x=3
x es el numero desconocido
x³ = numero elevado al cubo
x³- 20 = numero elevado al cubo y disminuido en 20
Formamos la igualdad
x³-20 = 7
x³ = 7+20
x³ = 27
x =∛27
X = 3
comprobacion
3³ - 20 = 7
27-20 = 7
7 = 7
saludos