-9+5n+7n=3

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Solution for -9+5n+7n=3 equation: 


n in (-oo:+oo)

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

5*n+7*n-9-3 = 0

12*n-12 = 0 // + 12

12*n = 12 // : 12

n = 12/12

n = 1

n = 1

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