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

The equation is $\"\"$ .

Apply multiplication property of equality: Multiply each side by 4.

$\"\"$

$\"\"$ (Cancel common terms)

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

$\"\"$ (Multiply each side by negative one)

$\"\"$ (Product of two same signs is positive) $\"\"$

Check:

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

$\"\"$

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

Compare the values, the equation is true. $\"\"$

The value of r is $\"\"$ .