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k in (-oo:+oo)
(-1/2)*k-(7/10) = -59/120 // + -59/120
(-1/2)*k-(7/10)-(-59/120) = 0
(-1/2)*k-7/10+59/120 = 0
-1/2*k-5/24 = 0 // + 5/24
-1/2*k = 5/24 // : -1/2
k = 5/24/(-1/2)
k = -5/12
k = -5/12
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