9-2n+n=13

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Solution for 9-2n+n=13 equation: 


n in (-oo:+oo)

n-(2*n)+9 = 13 // - 13

n-(2*n)-13+9 = 0

n-2*n-13+9 = 0

-n-4 = 0 // + 4

-n = 4 // * -1

n = -4

n = -4

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