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2014-04-01T19:36:25-03:00
13x-15x= 21+11
-2x=32
2x=-32
x=-32/2
x=-16
1 5 1
2014-04-01T19:37:29-03:00
13x - 11 = 15x + 21 
13x - 15x = 21 + 11
-2x = 32 . (-1)
2x = - 32
x = -32/ 2
x = -16

1 1 1