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1/3 = x*((x-7)/2) // - x*((x-7)/2)
1/3-(x*((x-7)/2)) = 0
(-1*x*(x-7))/2+1/3 = 0
(-1*3*x*(x-7))/(2*3)+(1*2)/(2*3) = 0
1*2-1*3*x*(x-7) = 0
21*x-3*x^2+2 = 0
21*x-3*x^2+2 = 0
21*x-3*x^2+2 = 0
DELTA = 21^2-(-3*2*4)
DELTA = 465
DELTA > 0
x = (465^(1/2)-21)/(-3*2) or x = (-465^(1/2)-21)/(-3*2)
x = (465^(1/2)-21)/(-6) or x = (465^(1/2)+21)/6
(x-((465^(1/2)-21)/(-6)))*(x-((465^(1/2)+21)/6)) = 0
((x-((465^(1/2)-21)/(-6)))*(x-((465^(1/2)+21)/6)))/(2*3) = 0
((x-((465^(1/2)-21)/(-6)))*(x-((465^(1/2)+21)/6)))/(2*3) = 0 // * 2*3
(x-((465^(1/2)-21)/(-6)))*(x-((465^(1/2)+21)/6)) = 0
( x-((465^(1/2)+21)/6) )
x-((465^(1/2)+21)/6) = 0 // + (465^(1/2)+21)/6
x = (465^(1/2)+21)/6
( x-((465^(1/2)-21)/(-6)) )
x-((465^(1/2)-21)/(-6)) = 0 // + (465^(1/2)-21)/(-6)
x = (465^(1/2)-21)/(-6)
x in { (465^(1/2)+21)/6, (465^(1/2)-21)/(-6) }
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