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2014-10-06T21:36:43+03:00
-2/3(0,4x+1/2)-1/3=0,(6)
0,4=4/10 simplif.=2/5
0,(6)=6/9 simplif.=2/3
-2/3(2x/5+1/2)-1/3=2/3
-2/3(4x/10+5/10)-1/3=2/3
-8x/30-10/30-10/30=2/3
-8x/30-20/30=2/3
-8x/30=2/3+20/30
-8x/30=(20+20)/30
-8x/30=40/30     :30
-8x=40    (-1)
x=-40/8=-5