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k in (-oo:+oo)
4*(7*k+7) = 308 // - 308
4*(7*k+7)-308 = 0
4*(7*k+7)-308 = 0
28*k-280 = 0
28*k-280 = 0
28*k-280 = 0 // + 280
28*k = 280 // : 28
k = 280/28
k = 10
k = 10
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