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= 3x + 6 - 7x - 63
= 3x - 7x + 6 - 63
= -4x - 60
b. (6(-2ab - a²)) - (2a(4a + 5ab)) = (-12ab - 6a²) - (8a² + 10a²b)
= -12ab - 6a² - 8a² - 10a²b
= -12ab - 14a² - 10a²b
c. (-2(x² + x - 1) - (5(x² - 4x + 2)) = (-2x² - 2x + 2) - (5x² - 20x + 10)
= -2x² - 2x + 2 - 5x² + 20x - 10
= -2x² - 5x² - 2x + 20x + 2 -10
= -7x² + 18x - 8
d. (3b(5a² + 4a - 3b)) - (-4a(3a - 2a² - b))=(15a²b + 12ab - 9b²) - (-12a² - 8a³- 4ab)
= 15a²b + 12ab - 9b² + 12a² + 8a³ + 4ab
= 15a²b + 12a² + 8a³- 9b² + 12ab + 4ab
= 15a²b + 12a² + 8a³ - 9b² + 16ab