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K in (-oo:+oo)
K/20 = 13/50 // - 13/50
K/20-(13/50) = 0
K/20-13/50 = 0
1/20*K-13/50 = 0 // + 13/50
1/20*K = 13/50 // : 1/20
K = 13/50/1/20
K = 26/5
K = 26/5
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