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d in (-oo:+oo)
5*d-((1/3)*d)+1/9 = 169/9 // - 169/9
5*d-((1/3)*d)+1/9-(169/9) = 0
(-1/3)*d+5*d+1/9-169/9 = 0
14/3*d-56/3 = 0 // + 56/3
14/3*d = 56/3 // : 14/3
d = 56/3/14/3
d = 4
d = 4
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