n+9=30-6n

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Solution for n+9=30-6n equation: 


n in (-oo:+oo)

n+9 = 30-(6*n) // - 30-(6*n)

n+6*n-30+9 = 0

7*n-21 = 0 // + 21

7*n = 21 // : 7

n = 21/7

n = 3

n = 3

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