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d in (-oo:+oo)
7*(6-(6*d)) = -252 // + 252
7*(6-(6*d))+252 = 0
7*(6-6*d)+252 = 0
7*(6-6*d)+252 = 0
294-42*d = 0
294-42*d = 0
294-42*d = 0 // - 294
-42*d = -294 // : -42
d = -294/(-42)
d = 7
d = 7
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