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(x^2+2x+1) - (x^2-2x+1)=x+9
x^2-x^2+2x+2x+1-1=x+9
4x=x+9
4x-x=9
3x=9
x=3
b)(3x-1)(x+1)=3x^2
3x^2+3x-x-1=3x^2
3x^2-3x^2+2x=1
2x=1
x=1/2