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