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d in (-oo:+oo)
-(2*d)-10 = 7*d+8 // - 7*d+8
-(2*d)-(7*d)-10-8 = 0
-2*d-7*d-10-8 = 0
-9*d-18 = 0 // + 18
-9*d = 18 // : -9
d = 18/(-9)
d = -2
d = -2
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