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4x^2-4x+1=0
(2x-1)^2=0
2x-1=0
x=1/2
b) (x-2)^2=x-3 /-(x-3)
(x-3)^2 -1(x-3)=0
(x-3)[(x-3)-1]=0
(x-3)(x-4)=0
x=3 lub x=4