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X1 = -4 + raiz de 7
x2 = -4 - raiz de 7
9 - 3x( 2 - x) = 2(2x² - 6 - x )
9 - 6x + 3x² = 4x² - 12 - 2x
4x² - 3x² - 2x + 6x - 12 - 9 = 0
x² + 4x - 21 = 0
Solucion por discriminante : " x₁=3 , x₂= -7 "