R = 4 + 7x -sx 7x - sx = r - 4 x (7 -s) = r - 4 x = r -4 / 7 - s if we know the value of s and r, we can find the value of x. there is another way to solve this equation: r = 4 + 7x - sx 7x - sx = r - 4 7x - sx - (r - 4) = 0 if we put 7x - sx in plce of r - 4, we get 7x - sx - (7x - sx) = 0 7x - sx -7x +sx = 0 Now 7x- 7x = 0 and sx - sx = 0 So all the terms gives the answer 0 the solution o this equation could not be determined.
