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k in (-oo:+oo)
k/4 = 8.2 // - 8.2
k/4-8.2 = 0
1/4*k-8.2 = 0 // + 8.2
1/4*k = 8.2 // : 1/4
k = 8.2/1/4
k = 32.8
k = 32.8
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