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k in (-oo:+oo)
-7*k-10 = -27/2 // + -27/2
-7*k-(-27/2)-10 = 0
27/2-7*k-10 = 0
7/2-7*k = 0 // - 7/2
-7*k = -7/2 // : -7
k = -7/2/(-7)
k = 1/2
k = 1/2
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