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d in (-oo:+oo)
d-2 = (2/7)*d-7 // - (2/7)*d-7
d-((2/7)*d)-2+7 = 0
d+(-2/7)*d-2+7 = 0
5/7*d+5 = 0 // - 5
5/7*d = -5 // : 5/7
d = -5/5/7
d = -7
d = -7
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