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\frac{x^{2}}{5}+\frac{2\times 5}{5}
To add or subtract expressions, expand them to make their denominators the same. Multiply 2 times \frac{5}{5}.
\frac{x^{2}+2\times 5}{5}
Since \frac{x^{2}}{5} and \frac{2\times 5}{5} have the same denominator, add them by adding their numerators.
\frac{x^{2}+10}{5}
Do the multiplications in x^{2}+2\times 5.
\frac{x^{2}+10}{5}
Factor out \frac{1}{5}. Polynomial x^{2}+10 is not factored since it does not have any rational roots.