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d in (-oo:+oo)
8-d = 6*d+43 // - 6*d+43
8-d-(6*d)-43 = 0
8-d-6*d-43 = 0
-7*d-35 = 0 // + 35
-7*d = 35 // : -7
d = 35/(-7)
d = -5
d = -5
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