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u in (-oo:+oo)
9*u-((1/3)*u)-6 = 0
9*u+(-1/3)*u-6 = 0
26/3*u-6 = 0 // + 6
26/3*u = 6 // : 26/3
u = 6/26/3
u = 9/13
u = 9/13
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