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k in (-oo:+oo)
4-(7*k) = 32 // - 32
4-(7*k)-32 = 0
4-7*k-32 = 0
-7*k-28 = 0 // + 28
-7*k = 28 // : -7
k = 28/(-7)
k = -4
k = -4
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