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Answer:
Read the explanation!
Step-by-step explanation:
<em>Let the "certain number" be </em><em>. </em>
( is a symbol for multiplication).
<em>Create a few equations and expressions:</em>
The sum of 12 and a certain number:
The product of 3 and the number:
The sum of 12 and a certain number is equal to the product of 3 and the number:
=
Solve!
12=3x-x
12=2x
x=6