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d in (-oo:+oo)
(-2/7)*d = -6/35 // + -6/35
(-2/7)*d-(-6/35) = 0
(-2/7)*d+6/35 = 0
6/35-2/7*d = 0 // - 6/35
-2/7*d = -6/35 // : -2/7
d = -6/35/(-2/7)
d = 3/5
d = 3/5
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