Fill in the blanks:
$5 + 4 =$ and $5 x + 4 x =$

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Solution

Sum of $5 and 4 \Rightarrow 5 + 4 = 9$
Sum of $5 x and 4 x$ ,
$\Rightarrow 5 x + 4 x = (5 + 4) x$ (taking $x$ common)
$= 9 x$
Hence, the answers are $9 and 9 x$ respectively.

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