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