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