Andrew's three symmetric numbers

Algebra Level 3

Andrew was playing with three numbers a,ba,b and cc.
First, he subtracted bb from the sum of other two and got 1,
then he subtracted cc from the sum of other two and got 2,
then he subtracted aa from the sum of other two and got 3.

Then, Andrew challenged his friends to find the value of b+ca\dfrac{b+c}{a} . So what is the value of b+ca\dfrac{b+c}{a}?

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