Hi Shannon;
3x10=(2x10)+(1x_)
What I believe this is...
3x^{10}=2x^{10}+1x^{?}
?=10
3x^{10}=2x^{10}+1x^{10}
x^{10} is a single unit.
It is as single as x.
Just as 2x+x=3x, so too does 2x^{10}+1x^{10}=3x^{10}
If I have incorrectly understood the question, please let me know.
10/15/2013

Vivian L.
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