5/14+х+9/14=2/9+9/10= (2/3+х)+(1/5+1/3)=9/10+4/5-3/

1)5/14+х+9/14=2/9+9/10
1+х=1 11/90
х=1 11/90-1
х=11/90
2)(2/3+х)+(1/5+1/3)=9/10+4/5-3/10
2/3+х+1/5+1/3=9/10+8/10-3/10
1+х+1/5=1 4/10
1 1/4+х=1 4/10
х=1 4/10-1 1/4
х=3/20
ОТВЕТ:11/90 и 3/20