combine similar terms
(2x4 + 3x3 - 4) + (3x4 - 2x3 - 8)
2x^4 + 3x^4 + 3x^3 - 2x^3 - 4 - 8
*for terms with variables, add their numerical coefficients (or the numbers before them), thus:
5x^4 + x^3 - 12
so there,, :)
(2x4 + 3x3 - 4) + (3x4 - 2x3 - 8)
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