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d in (-oo:+oo)
4*d+(1/3)*d-9 = 103/3 // - 103/3
4*d+(1/3)*d-(103/3)-9 = 0
4*d+(1/3)*d-103/3-9 = 0
13/3*d-130/3 = 0 // + 130/3
13/3*d = 130/3 // : 13/3
d = 130/3/13/3
d = 10
d = 10
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