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d in (-oo:+oo)
(1/3)*d+9 = 137/15 // - 137/15
(1/3)*d-(137/15)+9 = 0
(1/3)*d-137/15+9 = 0
1/3*d-2/15 = 0 // + 2/15
1/3*d = 2/15 // : 1/3
d = 2/15/1/3
d = 2/5
d = 2/5
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