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2014-03-11T21:12:25+02:00
[56:(a+20)+7]x5-30=15|+30
[56:(a+20)+7]x5=45|:5
56:(a+20)+7=9|-7
56:(a+20)=2|:2
a+20=28|-20
a=8
2014-03-11T21:25:57+02:00
[56:(a+20)+7]*5-30=15
[56:(a+20)+7]=9
56:(a+20)=2
56/(a+20)=2
2a+40=56
2a=16
a=8