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u in (-oo:+oo)
(-4/3)*u-6 = (7/3)*u+8 // - (7/3)*u+8
(-4/3)*u-((7/3)*u)-8-6 = 0
(-4/3)*u+(-7/3)*u-8-6 = 0
-11/3*u-14 = 0 // + 14
-11/3*u = 14 // : -11/3
u = 14/(-11/3)
u = -42/11
u = -42/11
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