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(x+5) (x+7) = (x+5) x
x² + 12x + 35 = x (x + 5)
x² + 12x + 35 = x² + 5x
x² - x² + 12x - 5x = - 35
7x = - 35
x = - 35/7
x = - 5
Solución :
x = - 5
x² + 5x + 7x + 35 = x² + 5x
x² - x² + 12x - 5x + 35 = 0
0 + 7x + 35 = 0
7x = -35
x = -35/7
x = -5
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