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d in (-oo:+oo)
9/10-6*d = 669/10 // - 669/10
9/10-6*d-(669/10) = 0
9/10-6*d-669/10 = 0
-6*d-66 = 0 // + 66
-6*d = 66 // : -6
d = 66/(-6)
d = -11
d = -11
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