Move all terms to the left side and set equal to zero. then set each factor equal to zero. x=1,-3
Answer:
Elizabeth had 30 stamps originally.
Step-by-step explanation:
Let,
x be the number of stamps Elizabeth have.
Number of stamps given to John = 1/6 of x = 
Remaining stamps = 
Stamps given to Peter = 1/5 of remainder = 
Number of stamps left = 20
Now,

Dividing both sides by 4

Hence,
Elizabeth had 30 stamps originally.