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Condicion
2X² = X + 66
2X² - X - 66 = 0.
Donde a = 2; b = -1, c = -66
X1 = (1+ 23)/4; X1 = (24)/4; X1 = 6
X2 = (1 - 23)/4; X2 = (-22)/4 = -5.5
Rta, El numero es 6.
2(6²) = 72
72 = 6 + 66
El numero es 6