(x-3)^2-4(3-x)=0

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(x-3)^2-4(3-x)=0
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(x-3)^2-4(3-x)=0
(x-3)^2-4(3-x)=0

(x-3)^2-4(3-x)=0
(x-3)^2-4(3-x)=0
(x-3)^2+4(x-3)=0
(x-3)(x-3+4)=0
x1=3,x2=-1

(x-3)^2+4(x-3)=0
(x-1)^2=4
x-1=2或x-1=-2
x=3或x=-1

(a-b)^2=a^2-2ab+b^2
(x-3)^2-4(3-x)=0
x^2-6x+9-(12-4x)=0
x^2-6x+9-12+4x=0
x^2-2x-3=0
(x-3)(x+1)=0
x=3 或x=-1