Using the distributive principle:




Add the 50 and the 2



Multiply both sides by 



Put the 's in parentheses just for emphasis



Replace the 's by 's



Since 1 is the identity for multiplication, any number multiplied by 1
gives the same number as the number multip[lied by it, so we can just
eliminate the 's:



We can eliminate those parentheses:



Subtract  from both sides:



Do the subtractions:





Edwin