\[\frac{1}{6}{x}^{2}-\frac{1}{5}{x}^{3}+{x}^{2}-\frac{1}{6}{x}^{3}+11\]
1
Simplify  16x2\frac{1}{6}{x}^{2}  to  x26\frac{{x}^{2}}{6}.
x26−15x3+x2−16x3+11\frac{{x}^{2}}{6}-\frac{1}{5}{x}^{3}+{x}^{2}-\frac{1}{6}{x}^{3}+11

2
Simplify  15x3\frac{1}{5}{x}^{3}  to  x35\frac{{x}^{3}}{5}.
x26−x35+x2−16x3+11\frac{{x}^{2}}{6}-\frac{{x}^{3}}{5}+{x}^{2}-\frac{1}{6}{x}^{3}+11

3
Simplify  16x3\frac{1}{6}{x}^{3}  to  x36\frac{{x}^{3}}{6}.
x26−x35+x2−x36+11\frac{{x}^{2}}{6}-\frac{{x}^{3}}{5}+{x}^{2}-\frac{{x}^{3}}{6}+11

4
Collect like terms.
(x26+x2)+(−x35−x36)+11(\frac{{x}^{2}}{6}+{x}^{2})+(-\frac{{x}^{3}}{5}-\frac{{x}^{3}}{6})+11

5
Simplify.
7x26−11x330+11\frac{7{x}^{2}}{6}-\frac{11{x}^{3}}{30}+11

Done
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