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= 5x - 9x - 24 + 32
= -4x + 8
b) (-6y - 7) - (4y - 9)
= - 6y - 4y - 7 + 9
= - 10y + 2
c) (a - 12) - ( -13a - 7)
= a + 13a - 12 + 7
= 14a - 5