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x in (-oo:+oo)
((3*(x^2-36))/15)*(x+8)*(x-6) = 0
(3*(x^2-36)*(x+8)*(x-6))/15 = 0
( x+8 )
x+8 = 0 // - 8
x = -8
( x-6 )
x-6 = 0 // + 6
x = 6
( x^2-36 )
1*x^2 = 36 // : 1
x^2 = 36
x^2 = 36 // ^ 1/2
abs(x) = 6
x = 6 or x = -6
x in { -8, 6, 6, -6 }
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