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 7/10x = 15 7/10 - 7 3/10x = 8 4/10a-7 9/13=3 4/13 a = 3 4/13 + 7 9/13a = 10 13/13a=1110 11/15-(m+3 2/15)=6 4/1510 11/15 - m - 3 2/15 = 6 4/157 9/15 - m = 6 4/15m = 7 9/15 - 6 4/15m = 1 5/15m = 1 1/3