Question

решите уравнение (1 2/7х - 1/3)21=2

Answer 1

(9/7 х-1/3)21=2

189/7х-21/3=2

27х-7=2

27х=2+7

х=9/27=1/3

 

Answer 2

1 2/7х-1/3=2/21

1 2/7х=2/21+1/3

1 2/7х=9/21

1 2/7х=9/7х=9/21

х=9/21:9/7

х=1/3