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x in (-oo:+oo)
(8*x^2)/8+(6*x)/8 = 0
x^2+3/4*x = 0
DELTA = (3/4)^2-(0*1*4)
DELTA = 9/16
DELTA > 0
x = ((9/16)^(1/2)-3/4)/(1*2) or x = (-(9/16)^(1/2)-3/4)/(1*2)
x = 0 or x = -3/4
x in { -3/4, 0 }
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