7 3/10+x=15

7/10 a-7 9/13=3 4/13

10 11/15 - (m+3 2/15) = 6 4/15

С решением,

7 3/10+x=15 7/10

x = 15 7/10 - 7 3/10

x = 8 4/10

a-7 9/13=3 4/13

a = 3 4/13 + 7 9/13

a = 10 13/13

a=11

10 11/15 - (m+3 2/15) = 6 4/15

10 11/15 - m - 3 2/15 = 6 4/15

7 9/15 - m = 6 4/15

m = 7 9/15 - 6 4/15

m = 1 5/15

m = 1 1/3

1) 7,3 + х = 15

х = 15-7,3

х = 7,7

2) 0,7 а - 7 9/13 = 3 4/13

0,7 а = 7 9/13 + 3 4/13

0,7 а = 11

а = 11/0,7

а = 15 5/7

3) 38/5 - м = 94/15

м = 4/3

м = 1 1/3