398+х=69*8
398+х=552
х= 552 -398
х=154
398+154=69*8
7*х=245:5
7*х=49
х= 49:7
х=7
7*7=245:5
398+x=69*8
398+x=552
x=552-398
x=154
154=154
7*x=245:5
7*x=49
x=49:7
x=7
7*7=245:5
7=7
398+х=69*8
398+х=552
х= 552 -398
х=154
398+154=69*8
7*х=245:5
7*х=49
х= 49:7
х=7
7*7=245:5
398+x=69*8
398+x=552
x=552-398
x=154
398+154=69*8
154=154
7*x=245:5
7*x=49
x=49:7
x=7
7*7=245:5
7=7