Решите уравнение
1) (3/5x-1 1/3)•15=7
2)( 2/3+5/7x)•21=29

1)
(3/5x-1 1/3)•15=7
3/5x-1 1/3=7/15
3/5x=7/15 + 1 1/3
3/5x=7/15 + 1 5/15
3/5x = 1 4/5
x = 1 4/5 : 3/5
x = 9/5 * 5/3
x=3


2)
( 2/3+5/7x)•21=29
2/3+5/7x=29/21
5/7x=29/21 - 2/3
5/7x = 29/21 - 14/21
5/7x = 5/7
x = 1