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x+x²+2x+1-109 = 0
x²+3x-108 = 0
(x+12)(x-9) = 0
x+12=0 =====> X1= -12
x-9=0 ======> x2=9
solo x2 es la solución por ser numero natural y satisfacer la igualdad planteada al principio
9+10²=109
9+100=109
109=109