+) Nếu x > 0
B = 3 . ( -1 ) - 2 . ( x + 3 )
B = -3 - 2x - 6
B = -9 - 2x
+) Nếu x < 0
B = 3 . ( - 1 ) - 2 . ( -x - 3 )
B = -3 + 2x + 3
B = 2x
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