Помогите Мне [latex]( \frac{17}{15}- \frac{1}{12})*6 \frac{2}{3} [/latex]

[latex]( \frac{17}{15} - \frac{1}{12} )*6 \frac{2}{3} =7[/latex] [latex] \frac{17}{15} - \frac{1}{12} = \frac{68-5}{60} =\frac{63}{60} = \frac{21}{20} =1 \frac{1}{20} =1,05[/latex] [latex]1,05*6 \frac{2}{3} = \frac{105}{100} * \frac{20}{3} = \frac{35}{5} =7[/latex]