Question 648770
Let's try this again, this time keeping track of the negative signs.  Assuming the equation you want solved is this:
{{{(-2/3)*x - 12 = 0}}} 
First, add 12 to both sides:
{{{(-2/3)*x - 12 + 12 = 0 + 12}}} 
{{{(-2/3)*x = 12}}} 
Next, divide both sides by {{{-2/3}}}, which is the same as multiplying by its reciprocal, {{{-3/2}}}
{{{(-3/2)*(-2/3)*x = (-3/2)*12}}} 
{{{x = (-3*12)/2}}}
{{{x = -36/2}}}
{{{x = -18}}}