6 - (8-b) - 4b
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6 - (8-b) -4b
= 6 - 8 + b - 4b (We open the bracket here. -(8-b) becomes -8+b)
= -2-3b (6-8=-2. b-4b=-3b)
= -(2+3b) (Taking the minus sign out)
Therefore, 6 - (8-b) -4b = -(2+3b)
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