Respostas

2013-09-03T19:51:49-03:00
2 ( x -5 )=7
2x - 10=7
2x=7+10
2X=17
X=17/2
1 5 1
2013-09-03T19:55:09-03:00
2(x-5)=7
2x-10=7
2x=10+7
2x=17
x= \frac{17}{2}