2ab - 3a/b = 15
ab + a/b = 10
Замена:
t = ab
l = a/b
2t - 3l = 15
t + l = 10
(2t - 3l) + (t + l) * 3 = 5t = 15 + 10*3 = 45
5t = 45
t = 9
l = 10 - t = 10 - 9 = 1
ab = 9
a/b = 1 ==> a = b ==> a*a=9 ==> a = b = +-3
ответ: a = b = +-3
