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x in (-oo:+oo)
x = 9*c-(d/c) // - 9*c-(d/c)
d/c-(9*c)+x = 0
d/c-9*c+x = 0
c^-1*d-9*c+x = 0 // - c^-1*d-9*c
x = -(c^-1*d-9*c)
x = -(c^-1*d-9*c)
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