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k in (-oo:+oo)
(1/2)*(k-7) = 2 // - 2
(1/2)*(k-7)-2 = 0
1/2*(k-7)-2 = 0
1/2*(k-7)-2 = 0
1/2*k-11/2 = 0
1/2*k-11/2 = 0
1/2*k-11/2 = 0 // + 11/2
1/2*k = 11/2 // : 1/2
k = 11/2/1/2
k = 11
k = 11
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