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u in (-oo:+oo)
(-4/3)*u+4 = (-1/3)*u-(7/5) // - (-1/3)*u-(7/5)
(-4/3)*u-((-1/3)*u)+7/5+4 = 0
(-4/3)*u+(1/3)*u+7/5+4 = 0
27/5-u = 0 // - 27/5
-u = -27/5 // * -1
u = 27/5
u = 27/5
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