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b) x, x+1, x+2
c) 2x, (2x+2)
d) x^2-x
e) 17-x
f) 17+x
g) p= 3j p+j=60
h) p+h=54 p=5h padre=45 hijo=9
i) p= 4h p=5(h-2) padre=40 hijo=10