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d in (-oo:+oo)
(6/7)*d = -1/5 // + -1/5
(6/7)*d-(-1/5) = 0
(6/7)*d+1/5 = 0
6/7*d+1/5 = 0 // - 1/5
6/7*d = -1/5 // : 6/7
d = -1/5/6/7
d = -7/30
d = -7/30
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