Question: how to subtract fractions with different denominators step by step?
Answer: Step 1: Find the least common denominator. Find the least common denominator (LCD) of the fractions. ... 
Step 2: Find the equivalent fraction. Find the equivalent fraction of each fraction so that they all have the LCD as the denominator.
Step 3: Subtract the new numerators. ... 
Step 4: Simplify if necessary.