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u in (-oo:+oo)
-4*u = 8/7 // - 8/7
-4*u-(8/7) = 0
-4*u-8/7 = 0
-4*u-8/7 = 0 // + 8/7
-4*u = 8/7 // : -4
u = 8/7/(-4)
u = -2/7
u = -2/7
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