Respostas

2013-07-14T19:20:01-03:00
A) 17x - 7x + x = 18
     9x = 18
       x =    2

b) x + x + 2x = 17 + 1 + 4
   4x = 22
   x = 5,5

c) x + 2x - 5x - 4x = -9 -3
-6 x = -12
 x = 2