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Expanding brackets 1.

Addition and subtraction of multi-term expression.
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Expanding brackets 1.

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Foundational topic:
Collecting like terms in algebraic expressions.
Adding a multi-term expression:
If a multi-term expression appears in a multi-term expression with positive sign, expanding the brackets can be performed by just removing them, with the signs of the terms remaining unchanged.
Subtraction of multi-term expression.
If there is a negative sign in front of a multi-term expression, when we expand the brackets then all the signs of the terms will be changed to their opposites.
Addition and subtraction:
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