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u in (-oo:+oo)
-3*u = 20/2 // - 20/2
-3*u-(20/2) = 0
-3*u-10 = 0
-3*u-10 = 0 // + 10
-3*u = 10 // : -3
u = 10/(-3)
u = -10/3
u = -10/3
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