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b. 5y-(-3y) + -3x - 5y -4 - 7 = 8y -8x -11
c. (5x² -9xy -4y²) - (-x² + 6xy + 3y²) = 6x² -15xy -7y²
d. 14x² -49 -4x +14x = 14x² +10 - 49