Respuesta :

Step-by-step explanation:

it is the ans .the value of a is 2.

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Answer:

Step-by-step explanation:

a + b = 5

b + c = 7

c + a = 6

c = 6 - a

b + 6 -  a = 7

b = 7 + a - 6

b = 1 + a

a + 1 + a = 5

2a + 1 = 5

2a = 4

a = 4/2

a = 2

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