$\"\"$

The equation is $\"\"$ .

According to multiplication property of equality:

For any number a, b and c, If a = b then ac = bc.

$\"\"$ (Multiply each side by 3)

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

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

$\"\"$ \ \

According to subtraction property of equality: if a = b, then $\"\"$ ;

$\"\"$ (Subtract 1 from both sides)

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

r = 23 (Subtract: $\"\"$ )

$\"\"$

Check:

To check the solution, substitute r = 23 in original equation.

$\"\"$

$\"\"$ (Add: 23 + 1 = 24)

8 = 8 (Divide: $\"\"$ )

Compare the values, the equation is true.

$\"\"$

The value of r = 23.