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d in (-oo:+oo)
(1/5)*(10*d-5) = 9 // - 9
(1/5)*(10*d-5)-9 = 0
1/5*(10*d-5)-9 = 0
1/5*(10*d-5)-9 = 0
2*d-10 = 0
2*d-10 = 0
2*d-10 = 0 // + 10
2*d = 10 // : 2
d = 10/2
d = 5
d = 5
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