6n+9=7n+12

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Solution for 6n+9=7n+12 equation: 


n in (-oo:+oo)

6*n+9 = 7*n+12 // - 7*n+12

6*n-(7*n)-12+9 = 0

6*n-7*n-12+9 = 0

-n-3 = 0 // + 3

-n = 3 // * -1

n = -3

n = -3

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