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x in (-oo:+oo)
(5*x^2)/15-((x-9)/6) = 3/2 // - 3/2
(5*x^2)/15-((x-9)/6)-(3/2) = 0
(5*x^2)/15-((x-9)/6)-3/2 = 0
(-1*(x-9))/6+(x^2)/3-3/2 = 0
(-1*2*3*(x-9))/(2*3*6)+(2*6*x^2)/(2*3*6)+(-3*3*6)/(2*3*6) = 0
2*6*x^2-1*2*3*(x-9)-3*3*6 = 0
12*x^2-6*x-54+54 = 0
12*x^2-6*x = 0
12*x^2-6*x = 0
6*x*(2*x-1) = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
6*x*(x-1/2) = 0
(6*x*(x-1/2))/(2*3*6) = 0
(6*x*(x-1/2))/(2*3*6) = 0 // * 2*3*6
6*x*(x-1/2) = 0
( 6*x )
6*x = 0 // : 6
x = 0
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
x in { 0, 1/2 }
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