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k in (-oo:+oo)
5*k-2 = 38-3*k // - 38-3*k
5*k-(-3*k)-38-2 = 0
5*k+3*k-38-2 = 0
8*k-40 = 0 // + 40
8*k = 40 // : 8
k = 40/8
k = 5
k = 5
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