Coordinated Triangle

Geometry Level pending

Let \(A, B\) and \(C\) be the intersection points between line \( r:\quad x+y-2=0 \), line \( s:\quad x-7y+2=0 \) and the \(x\)-axis. The sum of the coordinates of the gravity center of the \(ABC \) triangle is \(\text{__________} \).

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