x + 5 = 21, Five more than a number is 21., 3x − 4 = 17, Three times a number decreased by 4 is 17., x / 6 = 8, A number divided by 6 equals 8., 2x − 7 = 9, Seven less than twice a number is 9., 4x + 10 = 30, Four times a number plus 10 is 30.

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