Answer:
First convert the question into algebraic notation. So you have twelve less than the product of three and a number. The product of three and a number (that is, a variable) can be symbolized as 3x, and twelve less than that is 3x - 12 and this expression is less than 21 so that the whole thing comes out to 3x - 12 < 21 and this last inequality can be solved in the usual way.
3x - 12 < 21
3x < 33
x < 11
Step-by-step explanation:
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