Tìm x, biết: c) (5/7 - x) * 11/15 = -22/45

c) $(\frac{5}{7}-x).\frac{11}{15}=\frac{-22}{45}$

$\frac{5}{7}-x=\left(\frac{-22}{45}\right):\frac{11}{15}$

$\frac{5}{7}-x=\left(\frac{-22}{45}\right).\frac{15}{11}$

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

$x=\frac{5}{7}-\left(\frac{-2}{3}\right)$

$x=\frac{29}{21}$