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When adding polynomials, you may only combine similar terms. Similar terms are constants(without variables) and those with same variables raised to the same power.

For 5x³ + 9 -4x² +5 , there are no similar terms except for the constants. 
Therefore, 5x³ -4x² +14 is its simplest form. 

Note that we usually arrange terms in decreasing degree.
2 4 2
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