zad. 21 str. 119
matematyka wokół nas 1 zbiór zadań
a) x/2+x/3+x/4+x/6+x/12-2=x-4 (1/2-x/12 )
e) 2 (x - 3)/4 - 3 (x+2)/5 - x-1/2 = 1/4 (8 -5x) + 7/20
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