x^2/2 - 1/2 = x*(x + 5)/6
x^2 - 1 = (x^2 + 5x)/3
3x^2 - 3 = x^2 + 5x
2x^2 - 5x - 3 = 0
D = 25 + 24 = 49
x = (5 +- 7)/4
x1 = 3
x2 = -1/2
x^2/2 - 1/2 = x*(x + 5)/6
x^2 - 1 = (x^2 + 5x)/3
3x^2 - 3 = x^2 + 5x
2x^2 - 5x - 3 = 0
D = 25 + 24 = 49
x = (5 +- 7)/4
x1 = 3
x2 = -1/2