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x in (-oo:+oo)
(x/3+6)*(x/3-9) = 0
(1/3*x+6)*(1/3*x-9) = 0
( 1/3*x+6 )
1/3*x+6 = 0 // - 6
1/3*x = -6 // : 1/3
x = -6/1/3
x = -18
( 1/3*x-9 )
1/3*x-9 = 0 // + 9
1/3*x = 9 // : 1/3
x = 9/1/3
x = 27
x in { -18, 27 }
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