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x in (-oo:+oo)
(-3*x-12)*(5*x-(1/6)) = 0
(-3*x-12)*(5*x-1/6) = 0
( -3*x-12 )
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
( 5*x-1/6 )
5*x-1/6 = 0 // + 1/6
5*x = 1/6 // : 5
x = 1/6/5
x = 1/30
x in { -4, 1/30 }
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