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= 8 - 4 (2x + 5)
= 8 -8x - 20
= -8x - 12
nomer 2
= (9× -6)-(5x -3)
= 9x -6 -5x + 3
= 4x - 3
nomer 3
= 6a (3a²+7b)
= 18a³ + 42ab
nomer 4
= 2a-(-4b)+3c
= 2a + 4b + 3c