5x+4(12-x)=57. pilne. z gory dzieki za pomoc.
5x+4(12-x)=57
5x+48-4x=57 /-48
5x-4x=9
x=9
5x+48-4x=57
5x-4x=57-48
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5x+4(12-x)=57
5x+48-4x=57 /-48
5x-4x=9
x=9
5x+4(12-x)=57
5x+48-4x=57
5x-4x=57-48
x=9