Respostas

2013-05-23T22:16:26-03:00

3x²+3²x+7=4y

3(3y)²+3²(3y)+7=4y

3(9y)+9y²+7=4y

27+81y-4y=-7

27+77y=-7

77y=-7-27

77y=-34

y=-34/77

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