\"\"\"\"

\

The equation is “\"\"”

\

According to Division Property of equality: If \"\" then, \"\".

\

\"\"                 (Divide each side by 20)

\

According to Division inverse property: \"\".

\

\"\"

\

\"\"                                  (Divide: \"\")\"\"

\

The value of a is 5.

\

\

The division inverse and equality property are used.

\