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d in (-oo:+oo)
(-4/5)*d = -8/15 // + -8/15
(-4/5)*d-(-8/15) = 0
(-4/5)*d+8/15 = 0
8/15-4/5*d = 0 // - 8/15
-4/5*d = -8/15 // : -4/5
d = -8/15/(-4/5)
d = 2/3
d = 2/3
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