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2 Solutions

nx < C

you have to get rid of the constant from the left side and the x from the right side. In the given case you add 3 to get rid of the constant from the left side and subtract 5x from the right side. These operations have to be done on both sides.

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that's the whole point of the exercise. You perform operations to try to isolate the variable.

Knowing a value before hand isn't necessary. You simply apply arithmetic rules until the varible is alone.

If for example, x was 2 million, the math still works out. If x was ten thousand, the math still works out.

the only time it would matter is if you divided by x, then, becaues x could be 0, that wouldn't be a valid operation.

but, you can always subtract or multiply x.