7целых 3/5 - x =2целых2/3 x * 1 целую 5/7 = 4целая 1/7

$\displaystyle7\frac{3}{5} -x=2\frac{2}{3}$

$\displaystyle x=7\frac{3}{5}-2\frac{2}{3}$

$\displaystyle x=\frac{38}{5}-\frac{8}{3}$

$\displaystyle x=\frac{3*38}{3*5}-\frac{5*8}{5*3}$

$\displaystyle x=\frac{114}{15}-\frac{40}{15}$

$\displaystyle x=\frac{74}{15}$

$\displaystyle x =4\frac{14}{15}$

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$\displaystyle x*1\frac{5}{7}=4\frac{1}{7}$

$\displaystyle x=4\frac{1}{7}:1\frac{5}{7}$

$\displaystyle x=\frac{29}{7} :\frac{12}{7}$

$\displaystyle x=\frac{29}{7}*\frac{7}{12}$

$\displaystyle x=\frac{203}{84}$

$\displaystyle x=2\frac{5}{12}$