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d in (-oo:+oo)
(-28/60)*d = 54/60 // - 54/60
(-28/60)*d-(54/60) = 0
(-28/60)*d-9/10 = 0
-7/15*d-9/10 = 0 // + 9/10
-7/15*d = 9/10 // : -7/15
d = 9/10/(-7/15)
d = -27/14
d = -27/14
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