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2014-06-17T23:58:56+03:00
(18+41x2)+500:a-25x2=150
100+500:a-50
100+500:a=200
500:a=100
a=100/500
a=1/5

2xa=82-56+18:9
2xa=82-56-2
2xa=18
 xa=18/2=9

3xa=93-42+45/3
3xa=51+15
3xa=76
xa=76/3=25.(3)
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