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