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u in (-oo:+oo)
u/6-((2*u)/3) = u/12 // - u/12
u/6-((2*u)/3)-(u/12) = 0
u/6+(-2/3)*u-(u/12) = 0
-7/12*u = 0 // : -7/12
u = 0
u = 0
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