You need to get x on one side and the whole numbers on the other so you take 1680x - 550x because you are getting x to the other side and the oppisite of the positive in front of 550x is a negative. so 1680x-550x=1130x. Then you need to get the 35,000 to the other side. Take 175,000 - 35,000 and you get 140,000 so the equation is now 140,000= 1130x so this is saying what times 1130 is equal to 140,000 so u divide 140000 by 1130 and you get X= 123.89. approx.