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||4x-16|-6|=6
|4x-16|-6=6 lub |4x-16|-6=-6
|4x-16|=12 lub |4x-16|=0
4x-16=12 lub 4x-16=-12 lub 4x-16=0
4x=28 /:4 lub 4x=4 /:4 lub 4x=16 /:4
x=7 lub x=1 lub x=4