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simplificamos 20/15=4/3......entonces no queda 4/3=12/x....x=9
la media diferencial es "y" 21-y=y-33.......pasa a sumar al siguiente lado...
2y=21+33.....2y=54......y=27....
nos piden su suma "x+y"
9+27=36,,, espero te sirva