Answer:
x + 12 = 52
Step-by-step explanation:
Let variable x represent the unknown number.
Sum indicates that the expression employs the use of the operation addition using the terms that follow. In this case, those terms are x and 12. What this expression is set equal to in order to form an equation usually follows the word "is" within the given written expression. In this case, it is 52.
From this information, the equation can now be translates numerically.
x + 12 = 52
