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d in (-oo:+oo)
(1/15)*d = 1/30 // - 1/30
(1/15)*d-(1/30) = 0
(1/15)*d-1/30 = 0
1/15*d-1/30 = 0 // + 1/30
1/15*d = 1/30 // : 1/15
d = 1/30/1/15
d = 1/2
d = 1/2
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