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a. (5x-9)-(7x+15y)
5x-7x-15y-9
-2x-15y-9. ×(-1)(untuk menghilangkan (-) )
2x+15y+9
karena kurangkanlah (dari) maka di balik
b. (5y-3x-4)-(5x-3y+7)
-3x-5x+5y-(-3y)-4-7
-8x+8y-11 ×(-1)
8x-8y+11
c. (5x²-9xy-4y²)-(-x² -6xy+3y²)
5x²-(-x²)-9xy-(-6xy)-4y²-3y³
6x²-3xy-7y²