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If for example, you have an algebraic expression:
2x+3-x=17
You have to find what x is.
Rewrite the equation as simply as possible:
2x -x +3 = 17
2x -x must equal 1x (or just: x).
So x +3 = 17
Now you take the +3 to the other side of the "=" sign. You can also say you -3 from both sides, but really what you are doing is taking the number to the other side, and changing the + or - sign!
So x = 17 -3
Therefore, x = 14
It's very simple, really. I hope this is what you needed, otherwise be more specific, and I'd love to help :)
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