The question is ambiguous. Most likely the answer is 2x - 4 but it could be x*(2-4) = x*(-2) = -2x
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n - 10
It is 4n - 15.
A number decreased by 4 is n-4
Either 2*(n-4) = 2n - 8 or 2n - 4 It depends on whether the "twice" operates on "the number decreased by 4" or "the number".
4*(n + 2)