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k in (-oo:+oo)
10-7*k-(7*k) = 38 // - 38
10-7*k-(7*k)-38 = 0
10-7*k-7*k-38 = 0
-14*k-28 = 0 // + 28
-14*k = 28 // : -14
k = 28/(-14)
k = -2
k = -2
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