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k in (-oo:+oo)
2*(5*k+1) = 82 // - 82
2*(5*k+1)-82 = 0
2*(5*k+1)-82 = 0
10*k-80 = 0
10*k-80 = 0
10*k-80 = 0 // + 80
10*k = 80 // : 10
k = 80/10
k = 8
k = 8
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