Question 682748
{{{3(a+4)=2a-1}}}
Distribute the 3.
{{{3a+12=2a-1}}} 
Subtract 2a from both sides to get the variables on one side of the equal sign.
{{{3a-2a+12=2a-2a-1}}}
{{{a+12=-1}}}
Subtract 12 from both sides to isolate the a.
{{{a+12-12=-1-12}}}
{{{highlight(a=-13)}}}
Happy Calculating!!!