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d in (-oo:+oo)
d+6 = 3*d-10 // - 3*d-10
d-(3*d)+6+10 = 0
d-3*d+6+10 = 0
16-2*d = 0 // - 16
-2*d = -16 // : -2
d = -16/(-2)
d = 8
d = 8
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