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