Question 13353
Start solving this equation by moving the 5 to the right side of the equation.  Do this by adding 5 to both sides to get {{{(-3a)/4 = 7}}}.  Your next move should be to multiply both sides by 4 in order to get rid of the 4 on the left side.  After you do this, you get {{{(-3a) = 28}}}.  The final step is to get rid of the -3 by dividing it.  This gives you {{{a = (28/-3)}}}.