Упростите выражение 5/6(4.2х-1 1/5у)-5.4(2/9х-1.5у)

Решите задачу:

$\frac{5}{6}(4.2x-1 \frac{1}{5}y)-5.4( \frac{2}{9}x-1.5y)= \\ \\ \frac{5}{6}( \frac{21}{5}x- \frac{6}{5}y)- \frac{27}{5} ( \frac{2}{9}x- \frac{3}{2} y)= \\ \\ \frac{5}{6}* \frac{21}{5}x- \frac{5}{6} *\frac{6}{5}y- \frac{27}{5}* \frac{2}{9}x+ \frac{27}{5}* \frac{3}{2} y= \\ \\ \frac{7}{2}x- y- \frac{6}{5}x+ \frac{81}{10} y=3.5x-y-1.2x+8.1y=2.3x+7.1y$