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Q.

Find the sum of 3x+9 and 4x +11?

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a

7x +20

b

7x+9+11

c

3x+4x+9+11

d

3x+4x+20

answer is A.

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Detailed Solution

Given, 3x + 9 and 4x +11

Now, 3x and 4x are like term, hence 3x and 4x can be added to 7x.

We get , (3x + 9) + (4x +11) = 7x + 20

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Find the sum of 3x+9 and 4x +11?