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k in (-oo:+oo)
3*k+5*k+3/8 = 155/72 // - 155/72
3*k+5*k+3/8-(155/72) = 0
3*k+5*k+3/8-155/72 = 0
8*k-16/9 = 0 // + 16/9
8*k = 16/9 // : 8
k = 16/9/8
k = 2/9
k = 2/9
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