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-\frac{11}{9}x^{4}y\left(-\frac{37}{18}ab+\frac{3}{2}ab+\frac{5}{9}ab\right)
Combine -\frac{1}{3}ab and -\frac{31}{18}ab to get -\frac{37}{18}ab.
-\frac{11}{9}x^{4}y\left(-\frac{5}{9}ab+\frac{5}{9}ab\right)
Combine -\frac{37}{18}ab and \frac{3}{2}ab to get -\frac{5}{9}ab.
-\frac{11}{9}x^{4}y\times 0
Combine -\frac{5}{9}ab and \frac{5}{9}ab to get 0.
0x^{4}y
Multiply -\frac{11}{9} and 0 to get 0.
0
Anything times zero gives zero.
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