2) 5x - x^2 + 3 = x*(2-x)

5x - x^2 + 3 = 2x - x^2

5x + 3 = 2x

3x = -3

x = -1.

3) x(4x+1) -7(x^2-2x) = 3x(8-x) +6

4x^2 + x - 7x^2 +14x = 24x - 3x^2 + 6

15x = 24x + 6

-9x = 6