If \( 2 x^{2}+x y-3 y^{2}+x+a y-10=(2 x+3 y+b) \) \( (x-y-2) \), then find the value of \( a \) ...

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If \( 2 x^{2}+x y-3 y^{2}+x+a y-10=(2 x+3 y+b) \) \( (x-y-2) \), then find the value of \( a \) and \( b \).
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