solve 13x^2+9 (x+1)-(2x+3)(x+2)=6
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13x^2+9(x+1)-(2x+3)(x+2)=6
13x^2+9x+9-(2x2+4x+3x+6)
13x^2+9x+9-2x2-4x-3x-6=6
13x^2-2x2+2x+3=6
13x^2-2x2+2x+3=6
26-2x2+2x+3=6
-2x2+2x+29=6
-2x2+2x+29-6=0
-2x2+2x+23=0
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