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√(5x + 1) = 2 + 7
√(5x + 1) = 9 Elevas ambos miembros de la ecuación al cuadrado
(√(5x + 1))² = 9²
5x + 1 = 81
5x = 81 - 1
5x = 80
x = 80/5
x = 16
Respuesta .
x = 16