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18 = 6x + x² - 13x
18 = x² - 7x
0 = x² - 7x - 18
x - 9 = - 9x
x 2 = 2x
-------
- 7x
x = 9
18= 6x+ x2-13x
18= -7x+ x2
18= -7(-2) + (-2)2-->(al cuadrado)
18=14+4
18=18