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k in (-oo:+oo)
2*(7-2*k) = 10 // - 10
2*(7-2*k)-10 = 0
2*(7-2*k)-10 = 0
4-4*k = 0
4-4*k = 0
4-4*k = 0 // - 4
-4*k = -4 // : -4
k = -4/(-4)
k = 1
k = 1
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