The equation is 

Rewrite the equation in standard form Ax + By = C.

                          (Subtract 3x from each side)

                          (Apply Commutative property: )

                                     (Apply Additive inverse property: )

                                       (Apply Additive identity property: )

                         (Multiply each side by negative one)

                                          (Apply Product of two same signs is positive)

Compare the equation with standard form to find the values A, B and C.

The equation in standard form is .