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It seems like the solution dictionary does not contain an entry for x. If you inspect the solution dictionary before printing, you can see that the keys are x + x2, (x - 1)*(x - 2) + (y - 3)*(y - 4), (x2 - 1)*(x2 - 2) + (y2 - 3)*(y2 - 4) and y + y2. To print the solutions (independently of what is returned in the dictionaries) you can try

for soln in sols:
    for varbl in soln:
        print "{0} : {1},".format(varbl, soln[varbl])