[tex] \frac{1}{4} + y = \frac{17}{20} [/tex]
[tex]x = \frac{17}{20} - \frac{1}{4} [/tex]
[tex] \frac{3}{5} [/tex]
[tex] - y = - \frac{1}{9} + \frac{2}{5} [/tex]
[tex] - y = \frac{13}{45} [/tex]
[tex]y = - \frac{13}{45} [/tex]
