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d in (-oo:+oo)
-(6*d)-8 = 7*d-164 // - 7*d-164
164-(6*d)-(7*d)-8 = 0
164-6*d-7*d-8 = 0
156-13*d = 0 // - 156
-13*d = -156 // : -13
d = -156/(-13)
d = 12
d = 12
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