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-64x²=-81/:-1
64x²=81
x²=81:64
x=√81/64
x=⁹/₈
x=1⅛
-64x(2)=-81
64x(2)=81
x(2)=81/64
x=pierwiastek z 81/64
x=9/8
-64x²= -81całość razy -64
x²=81/64
x=9/8
x=1 ⅛