Maybe
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The abbreviation is equal or the equal sign: =
Equals sign demonstrates that something is the same as something, or equal to.
To get what is equivalent to 7 a plus 4b plus three you have to equate them to an equal sign.
well, it depends on what you mean by equivalent answers. there are many. common denominators? even numbers? the equal sign? this information has to be stated before you do anything.
Two expressions on both sides of the equal sign are equivalent to one of them changing sign when switched over to the other side. For instance: 5x = 3x + 10 Is equivalent to: 5x - 3x = 10 That means that you can very well "combine" them, if you don't forget to switch the sign. As it were, you would be switching it over and combining in a single step.