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`6)`

`1`$\dfrac{1}{3}$ `- 2`$\dfrac{2}{5}$ `+ x =` $\dfrac{5}{2}$ `- (`$\dfrac{1}{4}$ `-` $\dfrac{7}{8}$`)`

$\dfrac{4}{3}$ `-` $\dfrac{12}{5}$ `+ x =` $\dfrac{20}{8}$ `- (`$\dfrac{2}{8}$ `-` $\dfrac{7}{8}$`)`

$\dfrac{20}{15}$ `-` $\dfrac{36}{15}$ `+ x =` $\dfrac{20}{8}$ - $\dfrac{-5}{8}$

$\dfrac{-16}{15}$ `+ x =` $\dfrac{25}{8}$

`x =` $\dfrac{25}{8}$ `-` $\dfrac{-16}{15}$

`x =` $\dfrac{375}{120}$ `-` $\dfrac{-128}{120}$

`x =` $\dfrac{503}{120}$