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