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d in (-oo:+oo)
(-3/5)*d+6/7 = -159/35 // + -159/35
(-3/5)*d+6/7-(-159/35) = 0
(-3/5)*d+6/7+159/35 = 0
27/5-3/5*d = 0 // - 27/5
-3/5*d = -27/5 // : -3/5
d = -27/5/(-3/5)
d = 9
d = 9
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