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d in (-oo:+oo)
7*(2-4*d) = -294 // + 294
7*(2-4*d)+294 = 0
7*(2-4*d)+294 = 0
308-28*d = 0
308-28*d = 0
308-28*d = 0 // - 308
-28*d = -308 // : -28
d = -308/(-28)
d = 11
d = 11
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