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d in (-oo:+oo)
(-2/5)*d-1 = -13/10 // + -13/10
(-2/5)*d-(-13/10)-1 = 0
(-2/5)*d+13/10-1 = 0
3/10-2/5*d = 0 // - 3/10
-2/5*d = -3/10 // : -2/5
d = -3/10/(-2/5)
d = 3/4
d = 3/4
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