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k in (-oo:+oo)
(9/10)*k = 10.8 // - 10.8
(9/10)*k-10.8 = 0
9/10*k-10.8 = 0 // + 10.8
9/10*k = 10.8 // : 9/10
k = 10.8/9/10
k = 12
k = 12
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