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k in (-oo:+oo)
3*(2-7*k) = -183 // + 183
3*(2-7*k)+183 = 0
3*(2-7*k)+183 = 0
189-21*k = 0
189-21*k = 0
189-21*k = 0 // - 189
-21*k = -189 // : -21
k = -189/(-21)
k = 9
k = 9
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