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d in (-oo:+oo)
1/5-d = d-3/10 // - d-3/10
1/5-d-d-(-3/10) = 0
1/5-d-d+3/10 = 0
1/2-2*d = 0 // - 1/2
-2*d = -1/2 // : -2
d = -1/2/(-2)
d = 1/4
d = 1/4
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