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N1=x------> -5
N2=x+1----> -4
N3=x+2----> -3
N4=x+3----> -2
-------
-14
x+(x+1)+(x+2)+(x+3) = -14
4x +6 = -14
4x= -6 -14
x= - 20/4
x= -5
N1=2n=2(10)--------------20
N2=2n+2=2(10)+2-------22
N3=2n+4=2(10)+4--------24
-------
66
2n + (2n+2) + (2n+4) = 66
6n + 6 = 66
6n=66-6
n=60/6
n=10
espero ayude