If there is a plus, '+' sign before the brackets, then the signs of terms withinbrackets remain unchanged after removing the brackets.

If there is a minus, '-' sign before the brackets, then the signs of terms withinbrackets change, after removing the brackets.

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If plus, '+' sign is to be there before the brackets to be inserted, then the terms within the brackets need be written without any change in their signs.

If minus, '-' sign is to be there before the brackets to be inserted, then the terms within the brackets need be written after changing their signs.

Let us see two Examples one on Removal and one on Insertion of brackets.

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Write the first two terms and last two terms of the expression -2x + 3y + 4z + 5l - 6m within brackets keeping (i) plus, '+' sign and (ii) minus '-' sign before the brackets.

Solution to Example 2 of Algebra Rules: (i) -2x + 3y + 4z + 5l - 6m = +(-2x + 3y) + 4z +(5l - 6m) Ans. (ii) -2x + 3y + 4z + 5l - 6m = -(2x - 3y) + 4z -(-5l + 6m) Ans.

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