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d in (-oo:+oo)
-2*d-10 = -54/5 // + -54/5
-2*d-(-54/5)-10 = 0
54/5-2*d-10 = 0
4/5-2*d = 0 // - 4/5
-2*d = -4/5 // : -2
d = -4/5/(-2)
d = 2/5
d = 2/5
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