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d in (-oo:+oo)
6-5*d-(3*d) = -58 // + 58
6-5*d-(3*d)+58 = 0
6-5*d-3*d+58 = 0
64-8*d = 0 // - 64
-8*d = -64 // : -8
d = -64/(-8)
d = 8
d = 8
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