Question

How do you solve `3.2 = -0.4n`?

Answer 1

`n=-8`

Explanation:

To find the value of `n`, divide both sides by `-0.4`. Then you have `3.2/(-0.4)=(-0.4n)/(-0.4)`, and since `(-0.4)/-0.4=1`,

`3.2/(-0.4)=(-0.4n)/(-0.4)` simplifies to

`3.2/(-0.4)=(-0.4n)/(-0.4)`, and finally,

`-8=n`

If you're having trouble figuring out what operation to use to find the value of a variable, think about what the opposite operation of the one you need to "undo" is. Like here, `n` is multiplied by `-0.4`, so we have to divide to get the variable by itself.
Hope this helps, and happy mathing!