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a in (-oo:+oo)
((2/3)*a-1)*((3/4)*a-7) = 0
(2/3*a-1)*(3/4*a-7) = 0
( 2/3*a-1 )
2/3*a-1 = 0 // + 1
2/3*a = 1 // : 2/3
a = 1/2/3
a = 3/2
( 3/4*a-7 )
3/4*a-7 = 0 // + 7
3/4*a = 7 // : 3/4
a = 7/3/4
a = 28/3
a in { 3/2, 28/3 }
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