k -6 целых1/7 = 1целая 5 / 14

[tex]k-6 \frac{1}{7}=1 \frac{5}{14} [/tex]

[tex]k=6 \frac{1}{7}+1 \frac{5}{14} \\ \\ k=6 \frac{2}{14}+1\frac{5}{14} \\ \\ k=7 \frac{7}{14} \\ \\ k=7 \frac{1}{2} \\ \\ k=7,5 [/tex]