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u in (-oo:+oo)
(-4/5)*u+(1/5)*u = -7/5-(6/5) // + -7/5-(6/5)
(-4/5)*u+(1/5)*u-(-7/5)+6/5 = 0
(-4/5)*u+(1/5)*u+7/5+6/5 = 0
13/5-3/5*u = 0 // - 13/5
-3/5*u = -13/5 // : -3/5
u = -13/5/(-3/5)
u = 13/3
u = 13/3
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