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d in (-oo:+oo)
6*(4-d) = 18 // - 18
6*(4-d)-18 = 0
6*(4-d)-18 = 0
6-6*d = 0
6-6*d = 0
6-6*d = 0 // - 6
-6*d = -6 // : -6
d = -6/(-6)
d = 1
d = 1
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