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d in (-oo:+oo)
-2*d-(2/5) = -62/5 // + -62/5
-2*d-(2/5)-(-62/5) = 0
62/5-2*d-2/5 = 0
12-2*d = 0 // - 12
-2*d = -12 // : -2
d = -12/(-2)
d = 6
d = 6
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