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u in (-oo:+oo)
(-1/3)*u-(7/5) = 0
(-1/3)*u-7/5 = 0
-1/3*u-7/5 = 0 // + 7/5
-1/3*u = 7/5 // : -1/3
u = 7/5/(-1/3)
u = -21/5
u = -21/5
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