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According to the given system of equations, we simply need to get (x, y), then we can have (a, b).
We first simplify the first equation, then we get

. If we multiply

on each side then we simplify the equation, we get: 2x - 9y = 12
Now, we use the simplified equation to subtract the second equation, we get -3x = -6, then x = 2
Then, we substitute x = 2 into the simplified equation we get 2×2 - 9y = 12, so,