Resposta:

[tex]1)x {}^{2} + 6x = 5 + 3x \\ x {}^{2} + 6x - 3x - 5 \\ x {}^{2} + 3x - 5 = 0[/tex]

[tex]2)4x.(x + 3) + 9 = 0 \\ 4x {}^{2} + 12x + 9 = 0[/tex]

[tex]3)x.(x - 2) + 1 = 2.(x + 3) \\ x { }^{2} - 2x + 1 = 2x + 6 \\ x {}^{2} - 2x - 2x + 1 - 6 \\ x {}^{2} - 4x - 5 = 0[/tex]