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d in (-oo:+oo)
(-7/8)*d = -19/8 // + -19/8
(-7/8)*d-(-19/8) = 0
(-7/8)*d+19/8 = 0
19/8-7/8*d = 0 // - 19/8
-7/8*d = -19/8 // : -7/8
d = -19/8/(-7/8)
d = 19/7
d = 19/7
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