Put a 1 under the k so that everything will be a fraction
with a numerator and a denominator:



The denominators are 4,1,3.  They can all be divided into 12,
which is their LCM or LCD.  So we will multiply all the terms by 
12. But first let's put parentheses around all the terms:



Now we multiply every term by 

           

and get:



Then we cancel 



All that is left, when we ignore the denominators of 1, is this



Then we add +4 to both sides:



Then we divide both sides by 12



Then we cancel the 12's



And finally we have:



Edwin