Add the following
$2 a b - 3 c d, 4 a b + 5 c d$

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Solution

To add two or more algebraic expressions, such that the like terms of the expression are in the same column. Then add each column of like term
By adding the coefficient of like terms
$+$ $2 a b - 3 c d 4 a b + 5 c d_6 a b + 2 c d (∵ 2 + 4 = 6 & - 3 + 5 = 2)__$

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