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3( x+1)² = 75
3(x² + 2x + 1) =75
x² + 2x + 1 = 25
x² + 2x - 24 = 0
x 6
x -4
x+6 =0 ∧ x-4 =0
x = -6 ∧ x=4
los números son -6 y 4