Answer:
x=7/30
Step-by-step explanation:
[tex]x+\frac{2}{3} = \frac{9}{10} \\\\x=\frac{9}{10} -\frac{2}{3} =\frac{9*3 -2*10}{3*10} =\frac{7}{30} \\\\x=\frac{7}{30}[/tex]
Check
[tex]\frac{7}{30} +\frac{2}{3} =\frac{9}{10} \\\\\frac{7}{30} +\frac{2*10}{3*10} =\frac{9}{10} \\[/tex]
[tex]\frac{27}{30} =\frac{9}{10} \\\\\frac{9}{10} =\frac{9}{10}[/tex]
