$\"\"$ $\"\"$ $\"\"$

\

The expression is $\"\"$

\

According to subtraction property of equality: if $\"\"$ , then $\"\"$ .

\

$\"\"$ (Subtract 2x from each side)

\

$\"\"$ (Commutative property: a + b = b + a)

\

$\"\"$ (Additive invrese property: $\"\"$ )

\

$\"\"$ (Subtract: $\"\"$ ) $\"\"$

\

According to addition property of equality: if a = b, then a + c = b + c.

\

$\"\"$ (Add 4 to each side)

\

$\"\"$ (Additive invrese property: $\"\"$ )

\

$\"\"$ (Add: $\"\"$ )

\

$\"\"$ (Divide each side by 7)

\

$\"\"$ (Cancel common terms) $\"\"$

\

Check:

\

To check the solution, substitute $\"\"$ in original equation.

\

$\"\"$

\

$\"\"$ (Multiply: $\"\"$ )

\

$\"\"$ (Subtract: $\"\"$ )

\

$\"\"$ (Add: $\"\"$ ) $\"\"$

\

The value of the expression is $\"\"$ .