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d in (-oo:+oo)
5*(9-7*d) = 10 // - 10
5*(9-7*d)-10 = 0
5*(9-7*d)-10 = 0
35-35*d = 0
35-35*d = 0
35-35*d = 0 // - 35
-35*d = -35 // : -35
d = -35/(-35)
d = 1
d = 1
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