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x in (-oo:+oo)
6*x^2+(23*x)/7 = 0
6*x^2+23/7*x = 0
DELTA = (23/7)^2-(0*4*6)
DELTA = 529/49
DELTA > 0
x = ((529/49)^(1/2)-23/7)/(2*6) or x = (-(529/49)^(1/2)-23/7)/(2*6)
x = 0 or x = -23/42
x in { -23/42, 0 }
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