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u in (-oo:+oo)
(7/3)*u-(4/3) = (-3/4)*u-6 // - (-3/4)*u-6
(7/3)*u-((-3/4)*u)-(4/3)+6 = 0
(7/3)*u+(3/4)*u-4/3+6 = 0
37/12*u+14/3 = 0 // - 14/3
37/12*u = -14/3 // : 37/12
u = -14/3/37/12
u = -56/37
u = -56/37
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