2x + 4 = 24 is another way of putting it...
Deduct 4 from each side: 2x = 20
Divide each side by 2: x = 10. Job done.
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Call your number some variable, for example, "n". Twice the number would be 2n, adding four to that you get 2n + 4, and six times all that is 6(2n + 4), which is the same as 12n + 24.
24
12 or 24