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