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2014-08-02T14:09:17+03:00
112-(100-3a)*4 :23= 208:2

112 -(100-3a)*4:23=104

(100-3a)*4:23=112-104

(100-3a)*4:23=8

(100-3a):23=8:4

(100-3a):23=2

100-3a=2*23

100-3a=46

3a=100-46

3a=54

a=54:3

a=18