2n-9=-1

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Solution for 2n-9=-1 equation: 


n in (-oo:+oo)

2*n-9 = -1 // + 1

2*n-9+1 = 0

2*n-8 = 0 // + 8

2*n = 8 // : 2

n = 8/2

n = 4

n = 4

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