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b.-1/4
Sólo debes despejar, es decir,
a. no me dice= (29/10)-(7/5)= 3/2
b. no me dice= (45/28)-(13/7)= -1/4
X = el numero que no conoces
7/5+x=29/10
despejamos X
X=29/10-7/5
X=15/10
ambas tienen 5 parte
X=3/2
B.Lo mismo
13/7+X=45/28
X=45/18-13/7
X=-1/4
:D Espero que hayas entendido.