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x in (-oo:+oo)
((3/4)*x+6)*(1/2-3*x) = 0
(3/4*x+6)*(1/2-3*x) = 0
( 1/2-3*x )
1/2-3*x = 0 // - 1/2
-3*x = -1/2 // : -3
x = -1/2/(-3)
x = 1/6
( 3/4*x+6 )
3/4*x+6 = 0 // - 6
3/4*x = -6 // : 3/4
x = -6/3/4
x = -8
x in { 1/6, -8 }
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