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u in (-oo:+oo)
-4*u = -3/7 // + -3/7
-4*u-(-3/7) = 0
3/7-4*u = 0
3/7-4*u = 0 // - 3/7
-4*u = -3/7 // : -4
u = -3/7/(-4)
u = 3/28
u = 3/28
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