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d in (-oo:+oo)
7-5*d = 2*d+63 // - 2*d+63
7-5*d-(2*d)-63 = 0
7-5*d-2*d-63 = 0
-7*d-56 = 0 // + 56
-7*d = 56 // : -7
d = 56/(-7)
d = -8
d = -8
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