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d in (-oo:+oo)
7/10-d = 5*d-(713/10) // - 5*d-(713/10)
7/10-d-(5*d)+713/10 = 0
7/10-d-5*d+713/10 = 0
72-6*d = 0 // - 72
-6*d = -72 // : -6
d = -72/(-6)
d = 12
d = 12
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