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k in (-oo:+oo)
(k-10)/2 = -7 // + 7
(k-10)/2+7 = 0
(k-10)/2+(2*7)/2 = 0
k+2*7-10 = 0
k+4 = 0
(k+4)/2 = 0
(k+4)/2 = 0 // * 2
k+4 = 0
k+4 = 0 // - 4
k = -4
k = -4
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