Answer:
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Step-by-step explanation:
Split the equation into two separate equations (one with a positive and one with a negative), and then solve both equations.
POSITIVE:
2b - 9 = b - 6
b = 3
NEGATIVE:
2b - 9 = -(b - 6)
2b - 9 = -b + 6
3b = 15
b = 5
Answer: b=3, b=5
