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2012-04-18T19:22:31+02:00
2012-04-18T19:22:43+02:00

(14-x)/(11-x) x 14/11 = 1

 

14(14-x)/[11(11-x)] = 1

14(14-x) = 11(11-x)

14(14-x) = 11(11-x)

14² - 14x = 11² - 11x

14x - 11x = 14² - 11²

3x = 196 - 121

x = 75/3

x = 25