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1) 3x^2 - 6x - x +6 = 23x - 69
3x^2 - 7x - 23x + 6 + 69 = 0
3x^2 - 30x + 75 = 0
Aplicando Fórmula general
x1= 5 ; x2= 5
2) 7x - 21 - 5x^2 + 5 = x^2 - 5x - 10
x^2 - 5x - 10 - 7x + 21 + 5x^2 = 0
5x^2 - 12x + 11 = 0
Con la fórmula
x1= (12+8.7i)/10 = 2.0717i
x2= (12-8.7i)/10 = 0.32i {Soluciones con números complejos}