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2014-10-27T16:37:21+02:00
[(2a-5):5]-6=5
2a=(5+5)x5-6
2a=10x5-6
2a=50-6
2a=44
a=44:2
a=22
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2014-10-27T16:40:02+02:00
(a*2-5):5=5+6 (a*2-5):5=11 a*2-5=5*11 a*2-5=55 a*2=55+5 a*2=60 a=60:2 a=30
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