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x in (-oo:+oo)
x+9 = 5*x+13 // - 5*x+13
x-(5*x)-13+9 = 0
x-5*x-13+9 = 0
-4*x-4 = 0 // + 4
-4*x = 4 // : -4
x = 4/(-4)
x = -1
x = -1
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