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u in (-oo:+oo)
(-2/7)*u-(4/3) = 3/2 // - 3/2
(-2/7)*u-(4/3)-(3/2) = 0
(-2/7)*u-4/3-3/2 = 0
-2/7*u-17/6 = 0 // + 17/6
-2/7*u = 17/6 // : -2/7
u = 17/6/(-2/7)
u = -119/12
u = -119/12
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