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In this example second last step is subtracting 5x and adding 3 on both sides. My question is how would i know the number it could be 2 million or 10 thousand. How would I know these 2 numbers if i am doing a different question of same type.

2 Solutions
you don't need to know.  because it doesn't matter.
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.
Saqib Husain, SyedEngineerCommented:
To get the form

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.
mustish1Author Commented:
Thank You.
Actually, the key is to isolate the variables on one side of the equation and the known values on the other and it doesn't matter which side is which. You could just as easily have subtracted 5 and added 3x from both sides ending up with -5 -3 < 5x - 3x or  -8 < 2x which still translates to -4 < x which is the same as x > -4.

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