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2014-03-30T15:16:01+03:00
7m * 2 - 3(2m +5)*2 -11= 4m-17
14m - (6m +15)*2 - 11= 4m-17
14m -12m-30-11 -4m+17=0
-2m - 24=0
-2m=24=> m= -12