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3N+6=39
3N=39-6
3N=33
N=33/3
N=11
rpta=11
2x+1+2x+3+2x+5=39
6x+9=39
6x=39-9
6x=30
x=30/6
x=5
numero mas pqueño : (2x+1)= 2(5)+1
= 11