(x+2)²-10(x+2)+25=0

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(x+2)²-10(x+2)+25=0

(x+2)²-10(x+2)+25=0
(x+2)²-10(x+2)+25=0

(x+2)²-10(x+2)+25=0
化简得：x^2+4x+4-10x+5;
x^2-6x+9;
(x-3)^2=0;
x=3;