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x in (-oo:+oo)
x-9 = 5*x+19 // - 5*x+19
x-(5*x)-19-9 = 0
x-5*x-19-9 = 0
-4*x-28 = 0 // + 28
-4*x = 28 // : -4
x = 28/(-4)
x = -7
x = -7
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