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2=(x-2)(x-1)
2=x²-x-2x+2
2=x²-3x+2
x²-3x=0
x(x-3)=0
x=0 lub x=3
b) D:x≠1
6=4(x-1)
6=4x-4
10=4x
x=5/2
c) D:x≠-1, x≠-2
(2x-4)(x+2)=(x+1)(x-1)
2(x-2)(x+2)=x²-1
2(x²-4)=x²-1
2x²-8=x²-1
2x²-x²=-1+8
x²=7
x=√7 lub x=-√7