Look at the problem statement, for more specific instructions. You are usually expected to simplify such problems, as much as possible.
A relatively simple example:
2x + 3x
This can be simplified with the distributive property, to:
5x
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you cannot graph it without an equal sign and an x value.
expression or story problem if you are younger like 3rd-6th.
If two things are equal (as implied by the equals sign), then if you do something to one of those things (one side of the equal sign), unless you do the same to the other thing (the other side of the equals sign), then the two things will no longer be equal. Thus when solving, if you do not so the same to both sides, the sides will no longer be equal to each other and you will not solve the problem correctly.
No an algebraic expression does not contain an equal sign.
It means the figures on either side of the equal sign have equal values to each other.