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8x-1-(-3x+1)=
8x-1+3x+1=
5x
b) 27a - 9b : 3ab =
27a-9:3a=
27a-3/a=
3(9a-1/a)
b) 27a - 9b : 3ab = 9(3a - b):3ab = 3(3a - b):ab
8x - 4 : 4 - (- 3x + 1) = 8x - 1 + 3x - 1 = 11x - 2
b)
27a - 9b : 3ab = 9(3a - b) : 3ab = 3(3a - b) : ab