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= 5a - 2a + 4b - 7b - 3b
= 3a - 6
b) 3p + 2a + 1 - 2p + 4q + 6
= 2a + 3p - 2p + 4q + 1 + 6
= 2a + p + 4q + 7
c) 2m (4m - 3) - 3 (m - 2n)
= (2m × 4m) (2m × -3) (-3 × m) (-3 × -2n)
= 8m² - 6m - 3m + 6n
= 8m² - 9m + 6n
d) 7y + 3x (4y - x) - 5y (1 - x) + 5x²
= 7y (3x × 4y) (3x × -x) (-5y × 1) (-5y × -x) + 5x²
= 7y + 12xy - 3x² - 5y + 5xy + 5x²
= 5x² - 3x² + 7y - 5y + 12xy + 5xy
= 2x² + 2y + 17xy