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k in (-oo:+oo)
(1/5)*(k+12) = 25 // - 25
(1/5)*(k+12)-25 = 0
1/5*(k+12)-25 = 0
1/5*(k+12)-25 = 0
1/5*k-113/5 = 0
1/5*k-113/5 = 0
1/5*k-113/5 = 0 // + 113/5
1/5*k = 113/5 // : 1/5
k = 113/5/1/5
k = 113
k = 113
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