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d in (-oo:+oo)
-2*d-9 = 4*d+63 // - 4*d+63
-2*d-(4*d)-63-9 = 0
-2*d-4*d-63-9 = 0
-6*d-72 = 0 // + 72
-6*d = 72 // : -6
d = 72/(-6)
d = -12
d = -12
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