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d in (-oo:+oo)
-341/63 = (1/7)*d-5*d-(5/9) // - (1/7)*d-5*d-(5/9)
5/9-(-5*d)-((1/7)*d)-341/63 = 0
5*d+(-1/7)*d-341/63+5/9 = 0
34/7*d-34/7 = 0 // + 34/7
34/7*d = 34/7 // : 34/7
d = 34/7/34/7
d = 1
d = 1
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