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k in (-oo:+oo)
4*(7*k+4) = -236 // + 236
4*(7*k+4)+236 = 0
4*(7*k+4)+236 = 0
28*k+252 = 0
28*k+252 = 0
28*k+252 = 0 // - 252
28*k = -252 // : 28
k = -252/28
k = -9
k = -9
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