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x in (-oo:+oo)
(1/3)*x = (-1/2)*x-6 // - (-1/2)*x-6
(1/3)*x-((-1/2)*x)+6 = 0
(1/3)*x+(1/2)*x+6 = 0
5/6*x+6 = 0 // - 6
5/6*x = -6 // : 5/6
x = -6/5/6
x = -36/5
x = -36/5
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