Answer:
x=3
Explanation:
To answer the question we need to set up an equation and solve for the missing value.
Let's assume the unknown number is represented by the variable "x."
The given information states that "Three less than seven times a number," which can be expressed as "7x - 3."
According to the problem, this expression is equal to eighteen, so we have the equation:
⇒ 7x - 3 = 18
To find the missing value, we will solve this equation for "x."
First, let's isolate the variable term by adding 3 to both sides of the equation:
⇒ 7x - 3 + 3 = 18 + 3
Simplifying the equation gives us:
⇒ 7x = 21
Next, we'll divide both sides of the equation by 7 to solve for x:
⇒ (7x) / 7 = 21 / 7
∴ x = 3
Therefore, the missing value is x = 3.