Add the following expressions using column method:
$5 a - 6 b, 7 a + 8 b, - 5 a + 2 b$

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Solution

Here each expression is written in a separate row such that the like terms are arranged one below the other.
Then the addition of terms is carried out:
$5 a - 6 b 7 a + 8 b - 5 a + 2 b \bar{7 a + 4 b}$
Hence, the sum of the given expressions is $7 a + 4 b$ .

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