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d in (-oo:+oo)
(-3/5)*d = -36/5 // + -36/5
(-3/5)*d-(-36/5) = 0
(-3/5)*d+36/5 = 0
36/5-3/5*d = 0 // - 36/5
-3/5*d = -36/5 // : -3/5
d = -36/5/(-3/5)
d = 12
d = 12
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