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(2x+6)(x+2)+5=x^2+x+3x+3+6
2x^2+4x+6x+12+6=x^2+4x+9
2x^2+10x+18=x^2+4x+9
2x^2-x^2+10x-4x+18-9=0
x^2+6x+9=0
(x+3)(x+3)=0
x1=-3
x2=-3