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d in (-oo:+oo)
(2/15)*d-((3/5)*d) = 35 // - 35
(2/15)*d-((3/5)*d)-35 = 0
(2/15)*d+(-3/5)*d-35 = 0
-7/15*d-35 = 0 // + 35
-7/15*d = 35 // : -7/15
d = 35/(-7/15)
d = -75
d = -75
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