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d in (-oo:+oo)
8-d = 6*d-76 // - 6*d-76
8-d-(6*d)+76 = 0
8-d-6*d+76 = 0
84-7*d = 0 // - 84
-7*d = -84 // : -7
d = -84/(-7)
d = 12
d = 12
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