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k in (-oo:+oo)
6*k+k+1/5 = -349/5 // + -349/5
6*k+k+1/5-(-349/5) = 0
6*k+k+1/5+349/5 = 0
7*k+70 = 0 // - 70
7*k = -70 // : 7
k = -70/7
k = -10
k = -10
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