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d in (-oo:+oo)
d/7 = -3/5 // + -3/5
d/7-(-3/5) = 0
d/7+3/5 = 0
1/7*d+3/5 = 0 // - 3/5
1/7*d = -3/5 // : 1/7
d = -3/5/1/7
d = -21/5
d = -21/5
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