Question

3 8/9 *(5/7x-2/5+x)=2 1/4

Answer 1

3 8/9 *(5/7x-2/5+x)=2 1/4

3 8/9 *(1 5/7x-2/5)=2 1/4

1 5/7x-2/5=2 1/4 : 3 8/9

1 5/7x-2/5=9/4 : 35/9

1 5/7x-2/5=9/4·9/35

1 5/7x-2/5=81/140

1 5/7·х=81/140+2/5

1 5/7·х=81/140+56/140

12/7x=137/140

х=137/140:12/7

х=137/140·7/12

х=137/240