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k in (-oo:+oo)
2*(7*k+1) = 58 // - 58
2*(7*k+1)-58 = 0
2*(7*k+1)-58 = 0
14*k-56 = 0
14*k-56 = 0
14*k-56 = 0 // + 56
14*k = 56 // : 14
k = 56/14
k = 4
k = 4
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