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The equation is 

                  (Subtract 4j from each side)

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

                  (Apply Commutative property: a + b =b + a)

                                       (Subtract:)

                           (Add 7 to each side)

                                             (Add:)

According to division property of equality: If a = b then 

                                          (Divide each side by 2)

                                               (Cancel common terms)

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Verify:

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

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                 (Cancel common terms) \ \

                              (Multiply: )

                                            (Add: . Subtract,)

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

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The solution is.