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k in (-oo:+oo)
(1/5)*k-7+23 = 23 // - 23
(1/5)*k-23-7+23 = 0
1/5*k-7 = 0 // + 7
1/5*k = 7 // : 1/5
k = 7/1/5
k = 35
k = 35
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