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(2x² + 4x - x - 2) - (x² - x + 4x - 4) + 5 = 0
(2x² + 3x - 2) - (x² + 3x -4) + 5 = 0
2x² + 3x - 2 - x² - 3x + 4 + 5 = 0
2x² - x² + 3x - 3x - 2 + 4 + 5 = 0
x² + 7 = 0
x² = -7
Saludes. Martinez