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k in (-oo:+oo)
4*(5-7*k) = 160 // - 160
4*(5-7*k)-160 = 0
4*(5-7*k)-160 = 0
-28*k-140 = 0
-28*k-140 = 0
-28*k-140 = 0 // + 140
-28*k = 140 // : -28
k = 140/(-28)
k = -5
k = -5
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