Respostas

2014-07-31T13:00:52-03:00
A)
 X/4 - X/10 = 2 + 1
(5X - 2X)/ 20 = 3
5X - 2X = 60
3X = 60
X = 20
b)
50 + (3X - 4) =2 (3X - 4) + 26
3X - 4 = 6X - 8 + 26 - 50
6X - 18 - 50 = 3X - 4
6X - 3X = 50+ 18 - 4
3X = 64
X = 21,33
4 4 4