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