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d in (-oo:+oo)
5*d+7 = 73-6*d // - 73-6*d
5*d-(-6*d)-73+7 = 0
5*d+6*d-73+7 = 0
11*d-66 = 0 // + 66
11*d = 66 // : 11
d = 66/11
d = 6
d = 6
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