- BY Kevin Lehrbass
- POSTED IN Formulas
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**Here is an Algebra equation: 9x – 7 = 47**

If we know the value of **x** we can easily determine if the left side = the right side.

But in this case **x** is not a single value but rather a Domain (a set of numbers). **x** can be 5, 6, 7 or 8. We have four chances to get a true answer.

Here is the Excel formula —> **{=OR(9*{5,6,7,8}-7=47)} **

**Here is what happens inside the formula:**

**Step 1:** Multiply the 9 with each number inside of the array constant: **{=OR({45,54,63,72}-7=47)}**

**Step 2:** Subtract 7 from each of the numbers inside of the array constant: **{=OR({38,47,56,65}=47)}**

**Step 3:** Compare each number with 47 (TRUE means it’s the same): **{=OR({FALSE,TRUE,FALSE,FALSE})}**

**Step 4:** The final answer gives us **TRUE **(The OR function just needs 1 TRUE)

**Download my Excel file**

Download **here** or via **my OneDrive** (file 00070)

**Watch my YouTube video**

See how I caught the issue and several ways to fix it.

**What are the ingredients to my solution?**

OR function, constant array (that contains the 5,6,7,8), entered as an array formula that requires Control Shift Enter (not just enter).