Question

Решите уравнение:
5/7х+11/21х+2/3х=5 5/7

Answer 1

$frac{5}{7}x+frac{11}{21}x+frac{2}{3}x=5frac{5}{7}\frac{15}{21}x+frac{11}{21}x+frac{14}{21}x=frac{40}{7}\frac{40}{21}x=frac{40}{7}\x=frac{40}{7}:frac{40}{21}=frac{40}{7}*frac{21}{40}=3$