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d in (-oo:+oo)
(5/7)*d-(7/10) = -136/105 // + -136/105
(5/7)*d-(7/10)-(-136/105) = 0
(5/7)*d-7/10+136/105 = 0
5/7*d+25/42 = 0 // - 25/42
5/7*d = -25/42 // : 5/7
d = -25/42/5/7
d = -5/6
d = -5/6
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