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x in (-oo:+oo)
(1/3)*x-9 = (-1/4)*x-17 // - (-1/4)*x-17
(1/3)*x-((-1/4)*x)-9+17 = 0
(1/3)*x+(1/4)*x-9+17 = 0
7/12*x+8 = 0 // - 8
7/12*x = -8 // : 7/12
x = -8/7/12
x = -96/7
x = -96/7
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