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x in (-oo:+oo)
x*((4-x)/7) = -(5/3) // + 5/3
x*((4-x)/7)+5/3 = 0
(x*(4-x))/7+5/3 = 0
(3*x*(4-x))/(3*7)+(5*7)/(3*7) = 0
3*x*(4-x)+5*7 = 0
12*x-3*x^2+35 = 0
12*x-3*x^2+35 = 0
12*x-3*x^2+35 = 0
DELTA = 12^2-(-3*4*35)
DELTA = 564
DELTA > 0
x = (564^(1/2)-12)/(-3*2) or x = (-564^(1/2)-12)/(-3*2)
x = (2*141^(1/2)-12)/(-6) or x = (-2*141^(1/2)-12)/(-6)
(x-((2*141^(1/2)-12)/(-6)))*(x-((-2*141^(1/2)-12)/(-6))) = 0
((x-((2*141^(1/2)-12)/(-6)))*(x-((-2*141^(1/2)-12)/(-6))))/(3*7) = 0
((x-((2*141^(1/2)-12)/(-6)))*(x-((-2*141^(1/2)-12)/(-6))))/(3*7) = 0 // * 3*7
(x-((2*141^(1/2)-12)/(-6)))*(x-((-2*141^(1/2)-12)/(-6))) = 0
( x-((-2*141^(1/2)-12)/(-6)) )
x-((-2*141^(1/2)-12)/(-6)) = 0 // + (-2*141^(1/2)-12)/(-6)
x = (-2*141^(1/2)-12)/(-6)
( x-((2*141^(1/2)-12)/(-6)) )
x-((2*141^(1/2)-12)/(-6)) = 0 // + (2*141^(1/2)-12)/(-6)
x = (2*141^(1/2)-12)/(-6)
x in { (-2*141^(1/2)-12)/(-6), (2*141^(1/2)-12)/(-6) }
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