You can put this solution on YOUR website! one-fifth of the sum of a number and -3 is twice the number
--------
Equation::
(1/5)(x-3) = 2x
-------
Multiply both sides by 5 to get::
x-3 = 10x
-------
9x = -3
-------
x = -1/3
---------------------
Cheers,
Stan H.
================