You want to isolate x. First, lets move 8.60 to th other side: 40 + 8.60 = 7.25x => 48.60 = 7.25x Now, divide left and right by 7.25 48.60/7.25 = 7.25x/7.25 => x ≈ 6.7 (rounded) Tip: throw the equation in wolfram alpha. I'm sure you can work out the other one.
