Question 14338
{{{2a-b = ac+3b}}}  Add b to both sides.
{{{2a = ac+4b}}} Subtract ac from both sides.
{{{2a-ac = 4b}}} Factor the a on the left sides.
{{{a(2-c) = 4b}}} Finally, divide both sides by (2-c).
{{{a = 4b/(2-c)}}}