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x² = ( 1 -x)( 1 +x)
x² = 1 - x²
x² + x² = 1
2 x² = 1
x² = 1/2
x = -1/√2 lub x = 1/√2
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x²=1+x-x-x²
x²=1-x²
2x²-1=0
2x²=1
x²=1/2
x=√1/2
lub
x=-√1/2