How do you write this equation x+5=2(7+x)

Brook states that the distance on the line is 4 units. caleb states that the whole line does not have a distance because it continues on forever. vivian states that the line is 6 units long. which distance did brook measure? which distance did vivian measure?

Find the solution of system of equation y= x-4 y=4x+2

How is working backward similar to solving an equation?