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x in (-oo:+oo)
(7/12)*x-((7/6)*x^2) = 0
(-7/6)*x^2+(7/12)*x = 0
7/12*x-7/6*x^2 = 0
DELTA = (7/12)^2-(-7/6*0*4)
DELTA = 49/144
DELTA > 0
x = ((49/144)^(1/2)-7/12)/(-7/6*2) or x = (-(49/144)^(1/2)-7/12)/(-7/6*2)
x = 0 or x = 1/2
x in { 0, 1/2 }
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