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d in (-oo:+oo)
d+(1/5)*d-9 = -27/5 // + -27/5
d+(1/5)*d-(-27/5)-9 = 0
d+(1/5)*d+27/5-9 = 0
6/5*d-18/5 = 0 // + 18/5
6/5*d = 18/5 // : 6/5
d = 18/5/6/5
d = 3
d = 3
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