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x in (-oo:+oo)
x*((7*x-3)/4) = 3/5 // - 3/5
x*((7*x-3)/4)-(3/5) = 0
x*((7*x-3)/4)-3/5 = 0
(x*(7*x-3))/4-3/5 = 0
(5*x*(7*x-3))/(4*5)+(-3*4)/(4*5) = 0
5*x*(7*x-3)-3*4 = 0
35*x^2-15*x-12 = 0
35*x^2-15*x-12 = 0
35*x^2-15*x-12 = 0
DELTA = (-15)^2-(-12*4*35)
DELTA = 1905
DELTA > 0
x = (1905^(1/2)+15)/(2*35) or x = (15-1905^(1/2))/(2*35)
x = (1905^(1/2)+15)/70 or x = (15-1905^(1/2))/70
(x-((15-1905^(1/2))/70))*(x-((1905^(1/2)+15)/70)) = 0
((x-((15-1905^(1/2))/70))*(x-((1905^(1/2)+15)/70)))/(4*5) = 0
((x-((15-1905^(1/2))/70))*(x-((1905^(1/2)+15)/70)))/(4*5) = 0 // * 4*5
(x-((15-1905^(1/2))/70))*(x-((1905^(1/2)+15)/70)) = 0
( x-((15-1905^(1/2))/70) )
x-((15-1905^(1/2))/70) = 0 // + (15-1905^(1/2))/70
x = (15-1905^(1/2))/70
( x-((1905^(1/2)+15)/70) )
x-((1905^(1/2)+15)/70) = 0 // + (1905^(1/2)+15)/70
x = (1905^(1/2)+15)/70
x in { (15-1905^(1/2))/70, (1905^(1/2)+15)/70 }
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