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u in (-oo:+oo)
-((6/5)*u)-(3/2) = (1/5)*u+7 // - (1/5)*u+7
-((6/5)*u)-((1/5)*u)-(3/2)-7 = 0
(-6/5)*u+(-1/5)*u-3/2-7 = 0
-7/5*u-17/2 = 0 // + 17/2
-7/5*u = 17/2 // : -7/5
u = 17/2/(-7/5)
u = -85/14
u = -85/14
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