Respostas

2013-11-25T19:55:55-02:00
2(3x+30=90
6x+60=90
6x=90-60
6x=30
x=30/6
x=5



3.5+30
15+30
45 (metade de 90)
ou seja
x=5°
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2013-11-25T19:55:55-02:00