Answer:
x = 2
Step-by-step explanation:
Factor out the greatest common factor.
x^3-3x^2-x
→ x(x^2-3x-1)
ac = 71
ac = ab + bc
ac = 49 + 22
We need to write a proportion to solve this
7/3=35/x
105=7x
divide each side by 7
15=x so, there were 15 burgers without cheese.
We could add the cheese burgers 35 to burgers without cheese 15
35+15=50 burgers were sold.