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d in (-oo:+oo)
4/5-(3*d) = -7/10 // + -7/10
4/5-(3*d)-(-7/10) = 0
4/5-3*d+7/10 = 0
3/2-3*d = 0 // - 3/2
-3*d = -3/2 // : -3
d = -3/2/(-3)
d = 1/2
d = 1/2
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