Answer :
[tex]\frac{9}{10}+G=\frac{2}{3}[/tex]
we solve G
[tex]\begin{gathered} G=\frac{2}{3}-\frac{9}{10} \\ \\ G=\frac{10\times2-3\times9}{3\times10} \\ \\ G=\frac{-7}{30} \end{gathered}[/tex]the value of G is -7/30