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= 3x -4x -1 +5y -4x +y
= 3x -4x -4x +5y +y -1
= -5x +6y -1
2. 2x +3y(4x -5y) +7x -1
= 2x +12xy -15y² +7x -1
= 2x +7x +12xy -15y² -1
= 9x +12xy -15y² -1
Itu jawabannya.