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x in (-oo:+oo)
4*x-(9*x) = 11/2 // - 11/2
4*x-(9*x)-(11/2) = 0
4*x-9*x-11/2 = 0
-5*x-11/2 = 0 // + 11/2
-5*x = 11/2 // : -5
x = 11/2/(-5)
x = -11/10
x = -11/10
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