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d in (-oo:+oo)
(1/3)*d = 1/7 // - 1/7
(1/3)*d-(1/7) = 0
(1/3)*d-1/7 = 0
1/3*d-1/7 = 0 // + 1/7
1/3*d = 1/7 // : 1/3
d = 1/7/1/3
d = 3/7
d = 3/7
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