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d in (-oo:+oo)
-4*d = 20/7 // - 20/7
-4*d-(20/7) = 0
-4*d-20/7 = 0
-4*d-20/7 = 0 // + 20/7
-4*d = 20/7 // : -4
d = 20/7/(-4)
d = -5/7
d = -5/7
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