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x^2 = 81/ 9
x^2 = 9
x = √9
x = 3
..........:)
9x² = 81
Divides ambos miembros de la igualdad para 9
9x²/9 = 81/9
x² = 9
El exponente pasa como raíz
x = √9
Sacas la raíz +-
x₁ = 3
x₂ = - 3