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2014-10-15T21:04:46+03:00
50-5*[9+5-3*(2x-1)]=25
-5*[14-3*(2x-1)]=25-50
-5*[14-3*(2x-1)]=-25
14-3*(2x-1)=-25:-5 
14-3*(2x-1)=5
-3*(2x-1)=5-14
-3*(2x-1)=-9
2x-1=-9:-3
2x-1=3
2x=3+1
2x=4
x=4:2=>x=2
4 5 4