$${\mathtt{1.5}}{\mathtt{\,\times\,}}{\mathtt{\,-\,}}\left({\frac{{\mathtt{3}}}{{\mathtt{7}}}}\right){\mathtt{\,-\,}}{\frac{{\mathtt{4}}}{{\mathtt{7}}}}{\mathtt{\,\times\,}}{\mathtt{1.5}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{5}}}{{\mathtt{7}}}}{\mathtt{\,\times\,}}{\mathtt{1.5}} = {\mathtt{1.5}}{\mathtt{\,\times\,}}\left({\mathtt{\,-\,}}{\frac{{\mathtt{3}}}{{\mathtt{7}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{4}}}{{\mathtt{7}}}}{\mathtt{\,\small\textbf+\,}}{\frac{{\mathtt{5}}}{{\mathtt{7}}}}\right)$$
= $${\mathtt{1.5}}{\mathtt{\,\times\,}}{\mathtt{\,-\,}}\left({\frac{{\mathtt{2}}}{{\mathtt{7}}}}\right) = {\mathtt{\,-\,}}{\frac{{\mathtt{15}}{\mathtt{\,\times\,}}{\mathtt{2}}}{\left({\mathtt{10}}{\mathtt{\,\times\,}}{\mathtt{7}}\right)}} = {\mathtt{\,-\,}}{\frac{{\mathtt{3}}}{{\mathtt{7}}}}$$
$${\mathtt{12}}{\mathtt{\,\times\,}}\left(-{\mathtt{3}}\right){\mathtt{\,-\,}}{\mathtt{14}}{\mathtt{\,\times\,}}\left(-{\mathtt{3}}\right) = {\mathtt{6}}$$
$$\left(-{\mathtt{3}}\right){\mathtt{\,\times\,}}\left({\mathtt{12}}{\mathtt{\,-\,}}{\mathtt{14}}\right) = \left(-{\mathtt{3}}\right){\mathtt{\,\times\,}}\left(-{\mathtt{2}}\right)$$ = 6
Rest für dich !!
Gruß radix !