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Summation by Sigma Method

Add2x , 3x ,5...

Question

Add
$2 x, 3 x, 5 x$

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Solution

The given pairs of terms $2 x, 3 x a n d 5 x$ are like terms.
So, adding the numerical coefficient of each term.
The sum
$= 2 x + 3 x + 5 x = 10 x$

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