+6x+9=2x+6
+6x+9-2x-6=0
+4x+3=0
x2+3x+x+3=0
x × (x + 3) + x + 3 = 0
(x + 3)×(x + 1)=0
x + 3 = 0
x + 1 = 0
4500 (/9 = 500, /5 = 900)
x - I