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d in (-oo:+oo)
5*d-10 = (2/7)*d-10 // - (2/7)*d-10
5*d-((2/7)*d)-10+10 = 0
5*d+(-2/7)*d-10+10 = 0
33/7*d = 0 // : 33/7
d = 0
d = 0
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