3/7в(-14t-7/9y+2 1/3c)=-6t/b-1/by+1/bc
2 1/3c=7/3c
3 7 21 3*14t 3*7 3*21 6t 1 3
* (-14t - --- + ) = - - + = - - +
7b 9y 3c 7b 7b*9y 7b*3c b 3by bc
3/7в(-14t-7/9y+2 1/3c)=-6t/b-1/by+1/bc
2 1/3c=7/3c
3 7 21 3*14t 3*7 3*21 6t 1 3
* (-14t - --- + ) = - - + = - - +
7b 9y 3c 7b 7b*9y 7b*3c b 3by bc