STEP ONE: Add #4# to each side. You want to make sure to keep each variable to their own separate side!
#13x - 4 < 12x - 1#
#13x < 12x + 3#
STEP TWO: Subtract #12# from each side. Remember! You want each variable to be on their own separate sides! In this case, the #x# variable is on the left side and the numbers are on the right side.