Respostas

2013-09-08T12:46:56-03:00
100/25x + 10x +20 = 4x + 8x
4/x + 10x - 12x = -20
4/x - 2x = -20
4- 2x = -20x
20x - 2x = -4
18x = -4
x = -4, 5