Jeżeli to jest 30/100=x/(100+x), to:
x=30*(x+100)/100
100x=(30x+3000)
70x=3000
x=300/7
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Jeżeli to jest 30/100=x/(100+x), to:
x=30*(x+100)/100
100x=(30x+3000)
70x=3000
x=300/7