A number decreased by 4 is n-4
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When 3 times a number is decreased by 4 the result is 17. what is the number?
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".
7-x=4
if the quotient of -20 and 4 is decreased by 3
n - 10