Respostas

2013-08-13T18:40:22-03:00
7 (2+x) = 35+5 (x-12)
14 + 7x = 40 (x-12)
14 + 7x = 40x - 480
14 + 480 = 40x -7x
494= 33x
x=494/33
2013-08-13T18:43:17-03:00
14+7x = 40 (x-12)
14+7x = 40x-480
14+480=40x-7x
494 = 33x
x=494/33