x²-(x/2)²=192
x²-x²/4=192
4x²-x²=768
3x²=768
x²=256
x=-16 ∨ x=16
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x²-(x/2)²=192
x²-x²/4=192
4x²-x²=768
3x²=768
x²=256
x=-16 ∨ x=16