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x^=-4
x=-2 lub x=2
b)4/5x^-2=0/*4
5x^-2=0
5x^=2/:5
x^=2/5
x=pierwiastek 2/5 lub x= pierwiastek -2/5
c)4x^+1=0
4x^=-1
x^=-1/4
x=pierwiastek -1/4 lub x=1/4