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d in (-oo:+oo)
d/7 = 77/10 // - 77/10
d/7-(77/10) = 0
d/7-77/10 = 0
1/7*d-77/10 = 0 // + 77/10
1/7*d = 77/10 // : 1/7
d = 77/10/1/7
d = 539/10
d = 539/10
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