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=> 6x² - 12x + 15 + 8x² + 6x - 14
=> 14x² - 6x + 1
2.) [-x² + 6xy = 3y²] - [5x² - 9xy - 4y²]
=> (-x² + 6xy - 3y²) - (5x² - 9xy - 4y²)
=> -6x² + 15xy + y²
3.) (5x-3y+7) - (5y-3x-4)
=> 8x - 8y + 11
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