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k in (-oo:+oo)
2*(5*k-4) = 52 // - 52
2*(5*k-4)-52 = 0
2*(5*k-4)-52 = 0
10*k-60 = 0
10*k-60 = 0
10*k-60 = 0 // + 60
10*k = 60 // : 10
k = 60/10
k = 6
k = 6
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