( 29/42 - a ) - 13/42 = 11/42
29/42 - a = 13/42 + 11/42
a = 29/42 - 24/42
a = 5/42
-----------------------
15/17 - ( b - 3/17 ) = 6/17
15/17 - 6/17 = b - 3/17
9/17 + 3/17 = b
b = 12/17
-----------------------------
29/43 - m + 13/43 = 5/43
42/43 - m = 5/43
m = 42/43 - 5/43
m = 37/43