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x-7=0
x=7
x^2=0
x^2=4
x= pierwiastek z 4
x= 2 lub x= -2
x_1 = 0
x - 7 = 0 x_2 = 7
x² - 4 = 0 x² = 4 x_3 = 2 x_4 = -2