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d in (-oo:+oo)
1.8/2.5 = d/0.5 // - d/0.5
1.8/2.5-(d/0.5) = 0
1.8/2.5-2*d = 0
0.72-2*d = 0 // - 0.72
-2*d = -0.72 // : -2
d = -0.72/(-2)
d = 0.36
d = 0.36
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