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k in (-oo:+oo)
2*(k-4) = (1/2)*(4*k-16) // - (1/2)*(4*k-16)
2*(k-4)-((1/2)*(4*k-16)) = 0
2*(k-4)+(-1/2)*(4*k-16) = 0
2*(k-4)-1/2*(4*k-16) = 0
2*(k-4)-1/2*(4*k-16) = 0
0 = 0
0 = 0
k belongs to the empty set
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