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x in (-oo:+oo)
((4*x)/2)*(3*x-9) = x // - x
((4*x)/2)*(3*x-9)-x = 0
2*x*(3*x-9)-x = 0
2*x*(3*x-9)-x = 0
6*x^2-19*x = 0
6*x^2-19*x = 0
x*(6*x-19) = 0
6*x-19 = 0 // + 19
6*x = 19 // : 6
x = 19/6
x*(x-19/6) = 0
x*(x-19/6) = 0
( x-19/6 )
x-19/6 = 0 // + 19/6
x = 19/6
( x )
x = 0
x in { 19/6, 0 }
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