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18a - 5(a - 3b)
= 18a - 5a + 15b
= 13a + 15b
B.
12 + 2(4x - 3)
= 12 + 8x - 6
= 8x + 6
C.
8(3x + 4y) - 5(4x - 6y)
= 24x + 32y - 20x + 30y
= 4x + 62y
D.
5x(4x - 3y) - 3x(5x + 2y)
= 20x² - 15xy - 15x² - 6xy
= 5x² - 21xy