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k in (-oo:+oo)
4*(7-(7*k)) = -196 // + 196
4*(7-(7*k))+196 = 0
4*(7-7*k)+196 = 0
4*(7-7*k)+196 = 0
224-28*k = 0
224-28*k = 0
224-28*k = 0 // - 224
-28*k = -224 // : -28
k = -224/(-28)
k = 8
k = 8
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