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d in (-oo:+oo)
d/3 = -5/7 // + -5/7
d/3-(-5/7) = 0
d/3+5/7 = 0
1/3*d+5/7 = 0 // - 5/7
1/3*d = -5/7 // : 1/3
d = -5/7/1/3
d = -15/7
d = -15/7
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