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d in (-oo:+oo)
(5/7)*d = -5/7 // + -5/7
(5/7)*d-(-5/7) = 0
(5/7)*d+5/7 = 0
5/7*d+5/7 = 0 // - 5/7
5/7*d = -5/7 // : 5/7
d = -5/7/5/7
d = -1
d = -1
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