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u in (-oo:+oo)
4 = 3*u-(-7/(-8)) // - 3*u-(-7/(-8))
4-(3*u)-7/(-8) = 0
4-3*u-7/(-8) = 0
39/8-3*u = 0 // - 39/8
-3*u = -39/8 // : -3
u = -39/8/(-3)
u = 13/8
u = 13/8
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