63/100 = 1/100 * x/(x+100)
63 = x/(x+100)
63 (x + 100) = x
63 x + 6300 = x
62 x = -6300
x = -6300/62 = -3150/31
63/100 = 1/100 * x/(x+100)
63 = x/(x+100)
63 (x + 100) = x
63 x + 6300 = x
62 x = -6300
x = -6300/62 = -3150/31