Respostas

2014-08-10T19:30:21-03:00
Isolando t:
4t-3t = 5-9
t = -4
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2014-08-10T19:34:21-03:00
4t + 9 =3t +5
4t -  3t=-9 +5
t = -4

por favor avalie. grato
 
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