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u in (-oo:+oo)
(-3/2)*u-(6/5) = (7/5)*u-6 // - (7/5)*u-6
(-3/2)*u-((7/5)*u)-(6/5)+6 = 0
(-3/2)*u+(-7/5)*u-6/5+6 = 0
24/5-29/10*u = 0 // - 24/5
-29/10*u = -24/5 // : -29/10
u = -24/5/(-29/10)
u = 48/29
u = 48/29
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