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u in (-oo:+oo)
(-3/5)*u = 4 // - 4
(-3/5)*u-4 = 0
-3/5*u-4 = 0 // + 4
-3/5*u = 4 // : -3/5
u = 4/(-3/5)
u = -20/3
u = -20/3
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