Adding 1/2 to both sides is certainly a legal operation. However the problem asks us to solve for x. Looking at the equation we see that multiplying by 3 directly advances us in isolating x. That is, we respond directly to the request.
Those who cannot solve problems reliable will frequently look for something they can do without establishing a reason for doing it.
This leads to flailing at a problem rather than solving it.
Click on the appropriate response.
solution. Copyright 1997, Howard C. McAllister.