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x in (-oo:+oo)
-4*x-(5*x) = 11/2 // - 11/2
-4*x-(5*x)-(11/2) = 0
-4*x-5*x-11/2 = 0
-9*x-11/2 = 0 // + 11/2
-9*x = 11/2 // : -9
x = 11/2/(-9)
x = -11/18
x = -11/18
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