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k in (-oo:+oo)
2*(7*k+10) = 104 // - 104
2*(7*k+10)-104 = 0
2*(7*k+10)-104 = 0
14*k-84 = 0
14*k-84 = 0
14*k-84 = 0 // + 84
14*k = 84 // : 14
k = 84/14
k = 6
k = 6
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