Difference and sum

If the difference of 19/13 and his answer is 6/7, Bruno's answer is:

If the sum of his answer and 6/7 is 1/2, Bruno's answer is:

If his answer is the sum of 19/13 and 6/7, Bruno's answer is :

Correct answer:

a =  55/91
b =  -5/14
c =  211/91 = 2 2991

Step-by-step explanation:

 1319a = 76  a=131976=911339178=9113378=9155=0.6044
b+76 = 21  b=2176=1471412=14712=145=145=0.3571

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