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I'm not sure about this question, phrasing is a bit off. So you're doing algebra, and the question is AB+C, but tell me the answer and what A, B, or C is, an the answer is clear. Say AB+C= 17, and B is 7. Well then, A is 2, and C is 3. 2x7+3. 14+3, 17.

Perhaps you are referring to a decomposition reaction.

For example 2 H2O → 2 H2 + O2.

decomposition

Q: What type of reaction is it when you have AB equals A plus B?

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Synthesis reaction A+B=AB

Single replacement

When many were taught chemistry in the 1970s this was called a double decomposition reaction. It is now called a salt metathesis reaction and also double displacement reaction. There are examples and more information at the related link.

This would be a synthesis reaction. General formula A + B yields AB.

A synthesis reaction occurs when two or more simple substances combine to form more complex substances. A + B -> AB Reversing a synthesis reaction gives decomposition reaction. AB ->A + B

Related questions

An exothermic chemical reaction.

yes because ab plus bc is ac

2ab

Synthesis reaction A+B=AB

No, It is is a double replacement. AB +CD = AC + BD

Commutativity.

No. A times B = AB

The existence of the additive inverse (of ab).

associative property

the midpoint of AB.

C minus B equals AB

Yes an No. You can have blood type AB in following situations: AO+BO AO+BB AA+BO AA+BB AB+BB AA+AB AB+AB So there's more possible ways to get type AB other than the combination of ABs.