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a²x-25x=5-a
x(a²-25)=5-a
x(a-5)(a+5)=-(a-5) // * obie strony przez (-1)
-x(a-5)(a+5)=(a-5) // :obie strony przez -(a-5)(a+5) a≠5 i a≠-5
x=-1/(a+5)