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d in (-oo:+oo)
7*(1-(2*d)) = 7 // - 7
7*(1-(2*d))-7 = 0
7*(1-2*d)-7 = 0
7*(1-2*d)-7 = 0
-14*d = 0
-14*d = 0
-14*d = 0 // : -14
d = 0
d = 0
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