Which expression is equivalent to 12x - 8x + 3 and why?
3 + 4x, because (12x - 8x) + 3 = 4x + 3 = 3 + 4x
7x, because 12x - 8x + 3 = 4x + 3 = 7x
12x - 5, because 12x - (8x - 3) = 12x - 5
x, because 12x - 8x + 3 = 12x - 11x = x
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