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k in (-oo:+oo)
(1*k)/3+3 = 8 // - 8
(1*k)/3-8+3 = 0
k/3-8+3 = 0
1/3*k-5 = 0 // + 5
1/3*k = 5 // : 1/3
k = 5/1/3
k = 15
k = 15
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