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d in (-oo:+oo)
7-(d/4) = 5/2 // - 5/2
7-(d/4)-(5/2) = 0
7-(d/4)-5/2 = 0
9/2-1/4*d = 0 // - 9/2
-1/4*d = -9/2 // : -1/4
d = -9/2/(-1/4)
d = 18
d = 18
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