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2014-09-24T15:48:52+03:00

 b=3a

                      ==>3a = 120

a= b- 120

3a=120

a=120:3

a=40


b=40x3

b=120


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2014-09-24T16:00:55+03:00
 b=3a                      ==>3a = 120a= b- 1203a=120a=120:3a=40
b=40x3b=120
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