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d in (-oo:+oo)
(-1/5)*(d-5) = 9 // - 9
(-1/5)*(d-5)-9 = 0
-1/5*(d-5)-9 = 0
-1/5*(d-5)-9 = 0
-1/5*d-8 = 0
-1/5*d-8 = 0
-1/5*d-8 = 0 // + 8
-1/5*d = 8 // : -1/5
d = 8/(-1/5)
d = -40
d = -40
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