Explanation:
it is the ans .the value of a is 2.
Answer:
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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