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b.(5x-3y+7) - (15y-3x-4) = 2x - 18y + 3
c.(-x² +6xy + 3y² ) - (5x² - 9xy - 4y²) = -6x² - 3xy - y²
b.5y-3x-4-(5x-3y+7)= 5y-3x-4-5x+3y-7 = 8y-8x-11
c.5x²-9xy-4y²-(-x²+6xy+3y²) = 5x²-9xy-4y²+x²-6xy-3y² =6x²-15xy-7y²