-3(x+2y) - 2 (2x-y) + 5(x+y)
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-3x - 6y - 4x +2y + 5x + 5y
=> ( - 3x - 4x + 5x ) + ( - 6y + 5y + 2y )
=> - 2x + y
=> ( - 3x - 4x + 5x ) + ( - 6y + 5y + 2y )
=> - 2x + y
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