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5x-9 -7x-15y=
5x-7x-15y-9=-2x-15y-9
b. 5x-3y+7 -(5y-3x-4)=
5x-3y+7 -5y+3x+4=
5x+3x -3y-5y +7+4=8x-8y+11
c. x²-6xy+3y² -(5x²-9xy-4y²)=
x²-6xy+3y² -5x²+9xy+4y²=
x²-5x² -6xy+9xy +3y²+4y²=-4x²+3xy+7y²