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d in (-oo:+oo)
1-4*d = 3*d-76 // - 3*d-76
1-4*d-(3*d)+76 = 0
1-4*d-3*d+76 = 0
77-7*d = 0 // - 77
-7*d = -77 // : -7
d = -77/(-7)
d = 11
d = 11
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