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k in (-oo:+oo)
(3/8)*(k-5) = 36 // - 36
(3/8)*(k-5)-36 = 0
3/8*(k-5)-36 = 0
3/8*(k-5)-36 = 0
3/8*k-303/8 = 0
3/8*k-303/8 = 0
3/8*k-303/8 = 0 // + 303/8
3/8*k = 303/8 // : 3/8
k = 303/8/3/8
k = 101
k = 101
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