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

The expression is $\"\"$ .

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

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

$\"\"$ (Cancel common terms)

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

Check:

Substitutive the value $\"\"$ on original equation

$\"\"$

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

The value of $\"\"$ .