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k in (-oo:+oo)
-13 = 2*k-4*k+3 // - 2*k-4*k+3
-(-4*k)-(2*k)-13-3 = 0
4*k-2*k-13-3 = 0
2*k-16 = 0 // + 16
2*k = 16 // : 2
k = 16/2
k = 8
k = 8
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