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x in (-oo:+oo)
(-3/8)*x-((3*x^2)/(-7)) = 0
(3/7)*x^2+(-3/8)*x = 0
3/7*x^2-3/8*x = 0
DELTA = (-3/8)^2-(0*3/7*4)
DELTA = 9/64
DELTA > 0
x = ((9/64)^(1/2)+3/8)/(3/7*2) or x = (3/8-(9/64)^(1/2))/(3/7*2)
x = 7/8 or x = 0
x in { 0, 7/8 }
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