$6x^5 +5x^4+3 x^2+x$
Work Step by Step
We simplify by removing the parentheses and then combine the like terms as follows $$ (6x^5 + x^3 + x) + (5x^4 - x^3 + 3x^2)=6x^5 + x^3 + x+ 5x^4 - x^3 + 3x^2\\ =6x^5 +5x^4+3 x^2+x .$$
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