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k in (-oo:+oo)
k/7+0.6 = 5.7 // - 5.7
k/7-5.7+0.6 = 0
1/7*k-5.1 = 0 // + 5.1
1/7*k = 5.1 // : 1/7
k = 5.1/1/7
k = 35.70000071
k = 35.70000071
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