-9+n+n=-13 - solution

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Solution for -9+n+n=-13 equation:

n in (-oo:+oo)

n+n-9 = -13 // + 13

n+n-9+13 = 0

2*n+4 = 0 // - 4

2*n = -4 // : 2

n = -4/2

n = -2

n = -2

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