-7=-3n+n+9

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Solution for -7=-3n+n+9 equation: 


n in (-oo:+oo)

-7 = n-3*n+9 // - n-3*n+9

-(-3*n)-n-9-7 = 0

3*n-n-9-7 = 0

2*n-16 = 0 // + 16

2*n = 16 // : 2

n = 16/2

n = 8

n = 8

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