Respostas

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2014-03-22T00:50:53-03:00
4y-5y+1=3y-2y+1
-1y+1=1y+1
-1y-1y=1-1
-2y=0
y=0
1 5 1
2014-03-22T01:20:59-03:00
4y-5y+1=3y-2y+1
-y +1= y +1
-2y=0
y=0/-2

Y=0