SOLUTION: x+19 = -2x-40

Step 1.  Add 2x to both sides.  You will get an equivalent equation

         3x + 19 = -40.



Step 2.  In the last equation, subtract 19 from both sides.  You will get an equivalent equation

         3x = -59.



Step 3.  In the last equation, divide both sides by 3.  You will get the solution

         x =  = -.    ANSWER