3=(n-1)/2

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Solution for 3=(n-1)/2 equation: 


n in (-oo:+oo)

3 = (n-1)/2 // - (n-1)/2

3-((n-1)/2) = 0

(-1*(n-1))/2+3 = 0

(-1*(n-1))/2+(2*3)/2 = 0

2*3-1*(n-1) = 0

7-n = 0

(7-n)/2 = 0

(7-n)/2 = 0 // * 2

7-n = 0

7-n = 0 // - 7

-n = -7 // * -1

n = 7

n = 7

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