Respostas

2013-08-22T16:19:05-03:00
2x+3a-4+b=2a-1-a
3a-2a-a=-1+4-2x-b
2a=3-2x-b
a=3-2x-b
       2
2013-08-22T21:20:27-03:00
2x + 3a -4 + b = 2a -1 -a =
=2x +3a -4 +b = a - 1 =
= 3a - a = -1 -b +4 -2x =
=2a = 3 -2x -b =
=a = (3 - 2x -b) /2