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d in (-oo:+oo)
(3/7)*d+3/10 = -309/70 // + -309/70
(3/7)*d+3/10-(-309/70) = 0
(3/7)*d+3/10+309/70 = 0
3/7*d+33/7 = 0 // - 33/7
3/7*d = -33/7 // : 3/7
d = -33/7/3/7
d = -11
d = -11
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