\left. \begin{array} { l } { 3 - [ x - \{ 2 y - ( 5 x + y - 3 ) + 2 x ^ { 2 } \} - ( x ^ { 2 } - 3 y ) ] } \\ { x y - [ y z - z x - \{ y x - ( 3 y - x z ) - ( x y - z y ) \} ] } \\ { 2 a - 3 b - [ 3 a - 2 b - \{ a - c - ( a - 2 b ) \} ] } \end{array} \right.
Evaluate
3x^{2}-6x-2y+6,\ xy+2xz-3y,\ b-a-c
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