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