What does the side without a number mean?

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?