The answer to this equation is 10r=80.
Answer:

Step-by-step explanation:
Hi there!

Replace all x's with a-1:

I hope this helps!
Lets assume the whole pie is 1, that is all fractions added together have to sum 1.
If Victor eats 1/6 out of 5/6, then the rest is 4/6 of the pie, that is the subtraction of those fractions.