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y=jose
3x+2y=55
x+y=21...............x=21-y
hacemos sustitucion:
3x+2y=55
3(21-y)+2y=55
63-3y+2y=55
63-y=55
63-55=y
8=y
si y=8
x=21-y
x=21-8
x=13
juan tiene 13 años y jose tiene 8 años