5n+9=21+3n

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Solution for 5n+9=21+3n equation: 


n in (-oo:+oo)

5*n+9 = 3*n+21 // - 3*n+21

5*n-(3*n)-21+9 = 0

5*n-3*n-21+9 = 0

2*n-12 = 0 // + 12

2*n = 12 // : 2

n = 12/2

n = 6

n = 6

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