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k in (-oo:+oo)
2*k+8 = -3*k-47 // + -3*k-47
2*k-(-3*k)+8+47 = 0
2*k+3*k+8+47 = 0
5*k+55 = 0 // - 55
5*k = -55 // : 5
k = -55/5
k = -11
k = -11
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