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x in (-oo:+oo)
x*((-2/3)*x-(1/6))+7 = 6 // - 6
x*((-2/3)*x-(1/6))-6+7 = 0
x*((-2/3)*x-1/6)-6+7 = 0
x*(-2/3*x-1/6)-6+7 = 0
x*(-2/3*x-1/6)-6+7 = 0
7-2/3*x^2-1/6*x-6 = 0
1-2/3*x^2-1/6*x = 0
1-2/3*x^2-1/6*x = 0
1-2/3*x^2-1/6*x = 0
DELTA = (-1/6)^2-(-2/3*1*4)
DELTA = 97/36
DELTA > 0
x = ((97/36)^(1/2)+1/6)/(-2/3*2) or x = (1/6-(97/36)^(1/2))/(-2/3*2)
x = -3/4*((97/36)^(1/2)+1/6) or x = -3/4*(1/6-(97/36)^(1/2))
(x+3/4*((97/36)^(1/2)+1/6))*(x+3/4*(1/6-(97/36)^(1/2))) = 0
(x+3/4*((97/36)^(1/2)+1/6))*(x+3/4*(1/6-(97/36)^(1/2))) = 0
( x+3/4*((97/36)^(1/2)+1/6) )
x+3/4*((97/36)^(1/2)+1/6) = 0 // - 3/4*((97/36)^(1/2)+1/6)
x = -(3/4*((97/36)^(1/2)+1/6))
x = -3/4*((97/36)^(1/2)+1/6)
( x+3/4*(1/6-(97/36)^(1/2)) )
x+3/4*(1/6-(97/36)^(1/2)) = 0 // - 3/4*(1/6-(97/36)^(1/2))
x = -(3/4*(1/6-(97/36)^(1/2)))
x = -3/4*(1/6-(97/36)^(1/2))
x in { -3/4*((97/36)^(1/2)+1/6), -3/4*(1/6-(97/36)^(1/2)) }
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