x^2-x-12/4-x

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Solution for x^2-x-12/4-x equation: 


x in (-oo:+oo)

x^2-x-x-(12/4) = 0

x^2-x-x-3 = 0

x^2-2*x-3 = 0

DELTA = (-2)^2-(-3*1*4)

DELTA = 16

DELTA > 0

x = (16^(1/2)+2)/(1*2) or x = (2-16^(1/2))/(1*2)

x = 3 or x = -1

x in { -1, 3 }

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