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d in (-oo:+oo)
(5/7)*d-(1/3) = -172/21 // + -172/21
(5/7)*d-(1/3)-(-172/21) = 0
(5/7)*d-1/3+172/21 = 0
5/7*d+55/7 = 0 // - 55/7
5/7*d = -55/7 // : 5/7
d = -55/7/5/7
d = -11
d = -11
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