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7x +15y -(5x -9y)
7x +15y -5x +9y
7x -5x +15y +9y
2x +24y
2. Dibalik dahulu, sehingga
5y -3x -4 -(5x -3y +7)
5y -3x -4 -5x +3y -7
5y +3y -3x -5x -4 -7
8y -8x -11
3. Dibalik dahulu, sehingga
5x² -9xy -4y² -(-x² +6xy +3y²)
5x² -9xy -4y² +x² -6xy -3y²
5x² +x² -9xy -6xy -4y² -3y²
6x² -15xy -7y²