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x in (-oo:+oo)
x*((4*(5*x-7))/2) = 6.5 // - 6.5
x*((4*(5*x-7))/2)-6.5 = 0
(4*x*(5*x-7))/2-6.5 = 0
(4*x*(5*x-7))/2+(-6.5*2)/2 = 0
4*x*(5*x-7)-6.5*2 = 0
20*x^2-28*x-13 = 0
20*x^2-28*x-13 = 0
20*x^2-28*x-13 = 0
DELTA = (-28)^2-(-13*4*20)
DELTA = 1824
DELTA > 0
x = (1824^(1/2)+28)/(2*20) or x = (28-1824^(1/2))/(2*20)
x = (4*114^(1/2)+28)/40 or x = (28-4*114^(1/2))/40
(x-((28-4*114^(1/2))/40))*(x-((4*114^(1/2)+28)/40)) = 0
((x-((28-4*114^(1/2))/40))*(x-((4*114^(1/2)+28)/40)))/2 = 0
((x-((28-4*114^(1/2))/40))*(x-((4*114^(1/2)+28)/40)))/2 = 0 // * 2
(x-((28-4*114^(1/2))/40))*(x-((4*114^(1/2)+28)/40)) = 0
( x-((28-4*114^(1/2))/40) )
x-((28-4*114^(1/2))/40) = 0 // + (28-4*114^(1/2))/40
x = (28-4*114^(1/2))/40
( x-((4*114^(1/2)+28)/40) )
x-((4*114^(1/2)+28)/40) = 0 // + (4*114^(1/2)+28)/40
x = (4*114^(1/2)+28)/40
x in { (28-4*114^(1/2))/40, (4*114^(1/2)+28)/40 }
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