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k in (-oo:+oo)
7/10-3*k = 7*k+107/10 // - 7*k+107/10
7/10-3*k-(7*k)-(107/10) = 0
7/10-3*k-7*k-107/10 = 0
-10*k-10 = 0 // + 10
-10*k = 10 // : -10
k = 10/(-10)
k = -1
k = -1
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