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[tex] \frac{x ^{2}y ^{3} }{3z} + \frac{18xy}{6} \\ = \frac{2(x^{2}y ^{3}) + 18xyz }{6z} \\ = \frac{2x ^{2} y ^{3} + 18xyz }{6z} \\ = \frac{(2x ^{2} y ^{3} + 18xyz) \div 2 }{(6z) \div 2} \\ = \frac{x ^{2}y ^{3} + 9xyz}{3z} [/tex]
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