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d in (-oo:+oo)
5*d+3*d-(2/9) = 790/9 // - 790/9
5*d+3*d-(2/9)-(790/9) = 0
5*d+3*d-2/9-790/9 = 0
8*d-88 = 0 // + 88
8*d = 88 // : 8
d = 88/8
d = 11
d = 11
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