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The equation is 

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

             (Add 3r to each side)

                                      (Subtract:)

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According to subtraction property of equality: If a = b then a – c = b – c.

                     (Subtract 17 from each side)

                    (Apply commutative property)

                                             (Subtract: )

                                          (Divide each side by -3)

                                        (Cancel common terms) \ \

Verify:

To check the solution, substitute in original equation.

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                        (Cancel common terms)

                      (Multiply:)

                                     (Add: ,)

Compare the values, the equation is true. The solution is .

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The value of .