2) The expression is $\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$ \ \

\

$\"\"$ ---------------> (1) \ \

\

$\"\"$

\

$\"\"$ -------------------> (2) \ \

\

Multiply equation (1)*2 and equation (2) * 3 and adding

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

x value substitute equation (1)

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$