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2x-9= (x-3)(x+3)
2x-9 = x² - 9
-x² + 2x= 0
x(-x+2) = 0
x=0 lub x= 2
b)
(x+3)(x-1) = (x+1)(x-3)
x²-x+3x-3 = x²-3x+x-3
4x = 0
x = 0