n+2=-n+20 - solution

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Solution for n+2=-n+20 equation:

n in (-oo:+oo)

n+2 = 20-n // - 20-n

n+n-20+2 = 0

2*n-18 = 0 // + 18

2*n = 18 // : 2

n = 18/2

n = 9

n = 9

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