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d in (-oo:+oo)
(-1/9)*d+11 = -45 // + 45
(-1/9)*d+11+45 = 0
56-1/9*d = 0 // - 56
-1/9*d = -56 // : -1/9
d = -56/(-1/9)
d = 504
d = 504
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