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k in (-oo:+oo)
2-(7*k) = 2*k+74 // - 2*k+74
2-(7*k)-(2*k)-74 = 0
2-7*k-2*k-74 = 0
-9*k-72 = 0 // + 72
-9*k = 72 // : -9
k = 72/(-9)
k = -8
k = -8
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