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x in (-oo:+oo)
(1/3)*x+9 = (-2/3)*x-4 // - (-2/3)*x-4
(1/3)*x-((-2/3)*x)+4+9 = 0
(1/3)*x+(2/3)*x+4+9 = 0
x+13 = 0 // - 13
x = -13
x = -13
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