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x in (-oo:+oo)
x*((5*(6*x+7))/3) = 3 // - 3
x*((5*(6*x+7))/3)-3 = 0
(5*x*(6*x+7))/3-3 = 0
(5*x*(6*x+7))/3+(-3*3)/3 = 0
5*x*(6*x+7)-3*3 = 0
30*x^2+35*x-9 = 0
30*x^2+35*x-9 = 0
30*x^2+35*x-9 = 0
DELTA = 35^2-(-9*4*30)
DELTA = 2305
DELTA > 0
x = (2305^(1/2)-35)/(2*30) or x = (-2305^(1/2)-35)/(2*30)
x = (2305^(1/2)-35)/60 or x = (-(2305^(1/2)+35))/60
(x+(2305^(1/2)+35)/60)*(x-((2305^(1/2)-35)/60)) = 0
((x+(2305^(1/2)+35)/60)*(x-((2305^(1/2)-35)/60)))/3 = 0
((x+(2305^(1/2)+35)/60)*(x-((2305^(1/2)-35)/60)))/3 = 0 // * 3
(x+(2305^(1/2)+35)/60)*(x-((2305^(1/2)-35)/60)) = 0
( x+(2305^(1/2)+35)/60 )
x+(2305^(1/2)+35)/60 = 0 // - (2305^(1/2)+35)/60
x = -((2305^(1/2)+35)/60)
( x-((2305^(1/2)-35)/60) )
x-((2305^(1/2)-35)/60) = 0 // + (2305^(1/2)-35)/60
x = (2305^(1/2)-35)/60
x in { -((2305^(1/2)+35)/60), (2305^(1/2)-35)/60 }
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