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9*x-(x*((4*x+3)/2))+5*x-7 = 6/7 // - 6/7
9*x-(x*((4*x+3)/2))+5*x-(6/7)-7 = 0
9*x-(x*((4*x+3)/2))+5*x-6/7-7 = 0
(-1*x*(4*x+3))/2+9*x+5*x-6/7-7 = 0
(-1*7*x*(4*x+3))/(2*7)+(2*7*9*x)/(2*7)+(2*5*7*x)/(2*7)+(-6*2)/(2*7)+(-7*2*7)/(2*7) = 0
2*7*9*x-1*7*x*(4*x+3)+2*5*7*x-6*2-7*2*7 = 0
105*x-28*x^2+70*x-98-12 = 0
175*x-28*x^2-98-12 = 0
175*x-28*x^2-110 = 0
175*x-28*x^2-110 = 0
175*x-28*x^2-110 = 0
DELTA = 175^2-(-110*(-28)*4)
DELTA = 18305
DELTA > 0
x = (18305^(1/2)-175)/(-28*2) or x = (-18305^(1/2)-175)/(-28*2)
x = (18305^(1/2)-175)/(-56) or x = (18305^(1/2)+175)/56
(x-((18305^(1/2)-175)/(-56)))*(x-((18305^(1/2)+175)/56)) = 0
((x-((18305^(1/2)-175)/(-56)))*(x-((18305^(1/2)+175)/56)))/(2*7) = 0
((x-((18305^(1/2)-175)/(-56)))*(x-((18305^(1/2)+175)/56)))/(2*7) = 0 // * 2*7
(x-((18305^(1/2)-175)/(-56)))*(x-((18305^(1/2)+175)/56)) = 0
( x-((18305^(1/2)+175)/56) )
x-((18305^(1/2)+175)/56) = 0 // + (18305^(1/2)+175)/56
x = (18305^(1/2)+175)/56
( x-((18305^(1/2)-175)/(-56)) )
x-((18305^(1/2)-175)/(-56)) = 0 // + (18305^(1/2)-175)/(-56)
x = (18305^(1/2)-175)/(-56)
x in { (18305^(1/2)+175)/56, (18305^(1/2)-175)/(-56) }
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