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d in (-oo:+oo)
9/10-4*d = -231/10 // + -231/10
9/10-4*d-(-231/10) = 0
9/10-4*d+231/10 = 0
24-4*d = 0 // - 24
-4*d = -24 // : -4
d = -24/(-4)
d = 6
d = 6
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