15=(1(1/2))*(n+1)/2-(1/2)*(n-1)/2

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Solution for 15=(1(1/2))*(n+1)/2-(1/2)*(n-1)/2 equation: 


n in (-oo:+oo)

15 = (1*(1/2)*(n+1))/2-(((1/2)*(n-1))/2) // - (1*(1/2)*(n+1))/2-(((1/2)*(n-1))/2)

((1/2)*(n-1))/2-((1*(1/2)*(n+1))/2)+15 = 0

(-1/4)*(n+1)+((1/2)*(n-1))/2+15 = 0

(1/2*(n-1))/2-1/4*(n+1)+15 = 0

(-1/4*2*(n+1))/2+(1/2*(n-1))/2+(2*15)/2 = 0

1/2*(n-1)-1/4*2*(n+1)+2*15 = 0

30-1 = 0

29 = 0

29/2 = 0

29/2 = 0 // * 2

29 = 0

n belongs to the empty set

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