y = (x + 17) / (x - 15)
y(x-15) = x + 17
xy - 15y = x + 17
xy - x = 15y + 17
x(y - 1) = 15y + 17
x = (15y + 17) / (y -1)
"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram
Threaded Mode