Б) 3 1/3:(3/7x-13/15)=1 9/16

31/3:45x-91/105=19/16 31/3*105/45x-91=19/16 31*35/45 x-91=19/16 1085/45x-91=19/16 17360=19 (45x-91) -855x= -19089 x= 19089/855 x=2121/95

[latex]3 \frac{1}{3}:( \frac{3}{7}x- \frac{13}{15} )= 1 \frac{9}{16} [/latex] [latex]\frac{3}{7} x- \frac{13}{15}=3 \frac{1}{3} : 1 \frac{9}{16} [/latex] [latex] \frac{3}{7}x - \frac{13}{15} = \frac{10}{3} : \frac{25}{16} [/latex] [latex] \frac{3}{7}x - \frac{13}{15} = \frac{10}{3} * \frac{16}{25}- \frac{13}{15} [/latex] [latex] \frac{3}{7} x=2 \frac{2}{15} - \frac{13}{15} [/latex] [latex] \frac{3}{7}x=2 \frac{2}{15}- \frac{13}{15} [/latex] [latex] \frac{3}{7} x=1 \frac{4}{15} [/latex] [latex]x=1 \frac{4}{15}: \frac{3}{7} [/latex] [latex]x=1 \frac{4}{15} * \frac{7}{3} [/latex] [latex]x= \frac{21}{15} =1 \frac{6}{15} [/latex]