Mashaal Masha
Which of the following is equivalent to the sum of $3x^{4}+2x^{3}$ and $4x^{4}+7x^{3}$?
Difficulty: Medium
A: 

$16x^{14}$

B: 

$7x^{8}+9x^{6}$

C: 

$12x^{4}+14x^{3}$

D: 

$7x^{4}+9x^{3}$

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