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k in (-oo:+oo)
(7/8)*k-11 = -210.5 // + 210.5
(7/8)*k-11+210.5 = 0
7/8*k+199.5 = 0 // - 199.5
7/8*k = -199.5 // : 7/8
k = -199.5/7/8
k = -228
k = -228
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