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(5 - x)(20x - 11) = (10x - 3)(7 - 2x)
100x - 55 - 20x^2 + 11x = 70x - 20x^2 - 21 + 6x
100x - 55 + 11x = 70x - 21 + 6x
así que se elimina el término cuadrático
100x + 11x - 70x - 6x = -21 + 55 = 34
35x = 34
x = 34/35