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u in (-oo:+oo)
(-4*u)/3-(2/5) = 0
(-4*u)/3-2/5 = 0
-4/3*u-2/5 = 0 // + 2/5
-4/3*u = 2/5 // : -4/3
u = 2/5/(-4/3)
u = -3/10
u = -3/10
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