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k in (-oo:+oo)
4*(7*k+7) = 196 // - 196
4*(7*k+7)-196 = 0
4*(7*k+7)-196 = 0
28*k-168 = 0
28*k-168 = 0
28*k-168 = 0 // + 168
28*k = 168 // : 28
k = 168/28
k = 6
k = 6
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