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x in (-oo:+oo)
(1/5)*(3*x^2-10) = 18*x // - 18*x
(1/5)*(3*x^2-10)-(18*x) = 0
(1/5)*(3*x^2-10)-18*x = 0
1/5*(3*x^2-10)-18*x = 0
1/5*(3*x^2-10)-18*x = 0
3/5*x^2-18*x-2 = 0
3/5*x^2-18*x-2 = 0
3/5*x^2-18*x-2 = 0
DELTA = (-18)^2-(-2*3/5*4)
DELTA = 1644/5
DELTA > 0
x = ((1644/5)^(1/2)+18)/(3/5*2) or x = (18-(1644/5)^(1/2))/(3/5*2)
x = 5/6*((1644/5)^(1/2)+18) or x = 5/6*(18-(1644/5)^(1/2))
(x-5/6*(18-(1644/5)^(1/2)))*(x-5/6*((1644/5)^(1/2)+18)) = 0
(x-5/6*(18-(1644/5)^(1/2)))*(x-5/6*((1644/5)^(1/2)+18)) = 0
( x-5/6*((1644/5)^(1/2)+18) )
x-5/6*((1644/5)^(1/2)+18) = 0 // + -5/6*((1644/5)^(1/2)+18)
x = -(-5/6*((1644/5)^(1/2)+18))
x = 5/6*((1644/5)^(1/2)+18)
( x-5/6*(18-(1644/5)^(1/2)) )
x-5/6*(18-(1644/5)^(1/2)) = 0 // + -5/6*(18-(1644/5)^(1/2))
x = -(-5/6*(18-(1644/5)^(1/2)))
x = 5/6*(18-(1644/5)^(1/2))
x in { 5/6*((1644/5)^(1/2)+18), 5/6*(18-(1644/5)^(1/2)) }
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