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u in (-oo:+oo)
(-2/7)*u-(1/6) = 4/3 // - 4/3
(-2/7)*u-(1/6)-(4/3) = 0
(-2/7)*u-1/6-4/3 = 0
-2/7*u-3/2 = 0 // + 3/2
-2/7*u = 3/2 // : -2/7
u = 3/2/(-2/7)
u = -21/4
u = -21/4
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