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k in (-oo:+oo)
6*(7*k+3) = -276 // + 276
6*(7*k+3)+276 = 0
6*(7*k+3)+276 = 0
42*k+294 = 0
42*k+294 = 0
42*k+294 = 0 // - 294
42*k = -294 // : 42
k = -294/42
k = -7
k = -7
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