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d in (-oo:+oo)
3*(6-(7*d)) = 18 // - 18
3*(6-(7*d))-18 = 0
3*(6-7*d)-18 = 0
3*(6-7*d)-18 = 0
-21*d = 0
-21*d = 0
-21*d = 0 // : -21
d = 0
d = 0
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