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d in (-oo:+oo)
d-(4*d)+8 = -10 // + 10
d-(4*d)+8+10 = 0
d-4*d+8+10 = 0
18-3*d = 0 // - 18
-3*d = -18 // : -3
d = -18/(-3)
d = 6
d = 6
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