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½x + ¼x + ⅛x = 21 |*8
4x + 2x + x =168
7x= 168 |:7
x = 24
Ta liczba to 24.
1/2x + 1/4x + 1/8x = 21
4/8x + 2/8x + 1/8x = 21
7/8x = 21 / : 7/8
x = 24
:) proszę o naj ;d