Yes when multiplying. No when adding.
3n^3 + 3n^3 = 6n^3
3n^3 x 3n^3 = 9n^6
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You can't. You can only subtract like terms. Like terms must have exactly the same variables and exponents on the variables.
like terms
are known as like terms.
Like Terms and Variables
When combining like terms like 2x+3x we add their coeffitients, for example 2x+3x=(2+3)x=5x