How to write an equation and solve from a word problem

The video tutorial explains a problem where Brianna and Molly want to buy the same bicycle but lack sufficient funds individually. By defining a variable x as the cost of the bicycle, the teacher guides through setting up and solving an equation to find the cost. The solution involves understanding the money each needs and combining their funds to solve for x, which equals $138.

What equation can be formed to find the cost of the bicycle?

What is the final value of x, representing the cost of the bicycle?