1) 6,721+х+2,808=(19,46-5,722) - 2,209 2) (7,48+х) -(2,495+1,726)=4,381+3,46-2,582

1)
 6,721+х+2,808=(19,46-5,722) - 2,209
9,529+x = 11,529
x = 11,529-9,529
x = 2

2)
(7,48+х) -(2,495+1,726)=4,381+3,46-2,582
7,48+x-4,221= 5,259
3,259+x = 5,259
x=5,259-3,259
x = 2