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5x < 20
85n
125
5A-2
5+9(n)
5x+3
5x5x5
1/5x+5x
5n < 65
5 (9+x) Where x is the "a number"
4n-5 (Which is four times a number minus 5)
Five to the fifth power, or five times five times five times five times five.
3x + 5 = 29