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d in (-oo:+oo)
3/10-2*d = 223/10 // - 223/10
3/10-2*d-(223/10) = 0
3/10-2*d-223/10 = 0
-2*d-22 = 0 // + 22
-2*d = 22 // : -2
d = 22/(-2)
d = -11
d = -11
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