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d in (-oo:+oo)
-13 = d/7-5 // - d/7-5
5-(d/7)-13 = 0
-1/7*d-8 = 0 // + 8
-1/7*d = 8 // : -1/7
d = 8/(-1/7)
d = -56
d = -56
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