√(5 + x) + 3√(2 - y) = 6

5√(2 - y) - 2√(5 + x) = -1

Замена: √(5 + x) = a, √(2 - y) = b

a + 3b = 6

5b - 2a = -1

a = 6 - 3b

5b - 2•(6 - 3b) = -1

a = 6 - 3b

5b - 12 + 6b = -1

b = 1

a = 3

√(5 + x) = 3

√(2 - y) = 1

x = 4

y = 1