9-5n+7n=31

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Solution for 9-5n+7n=31 equation: 


n in (-oo:+oo)

7*n-(5*n)+9 = 31 // - 31

7*n-(5*n)-31+9 = 0

7*n-5*n-31+9 = 0

2*n-22 = 0 // + 22

2*n = 22 // : 2

n = 22/2

n = 11

n = 11

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