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k in (-oo:+oo)
7*(3*k+2) = -238 // + 238
7*(3*k+2)+238 = 0
7*(3*k+2)+238 = 0
21*k+252 = 0
21*k+252 = 0
21*k+252 = 0 // - 252
21*k = -252 // : 21
k = -252/21
k = -12
k = -12
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