[tex] = \frac{1}{9} - \frac{1}{3} [/tex]
[tex] = \frac{1}{9} + \frac{( - 1)}{3} [/tex]
[tex] = \frac{1}{9} + \frac{( - 3)}{9} [/tex]
[tex] = \frac{1 + ( - 3)}{9} [/tex]
#CarryOnLearning