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d in (-oo:+oo)
6-4*d = 4*d-74 // - 4*d-74
6-4*d-(4*d)+74 = 0
6-4*d-4*d+74 = 0
80-8*d = 0 // - 80
-8*d = -80 // : -8
d = -80/(-8)
d = 10
d = 10
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