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u in (-oo:+oo)
(-1/3)*u-(1/2) = 2/7 // - 2/7
(-1/3)*u-(1/2)-(2/7) = 0
(-1/3)*u-1/2-2/7 = 0
-1/3*u-11/14 = 0 // + 11/14
-1/3*u = 11/14 // : -1/3
u = 11/14/(-1/3)
u = -33/14
u = -33/14
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