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