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d in (-oo:+oo)
-95 = 2*d+7*d+4 // - 2*d+7*d+4
-(2*d)-(7*d)-95-4 = 0
-2*d-7*d-95-4 = 0
-9*d-99 = 0 // + 99
-9*d = 99 // : -9
d = 99/(-9)
d = -11
d = -11
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