9-7n+2n=4

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Solution for 9-7n+2n=4 equation: 


n in (-oo:+oo)

2*n-(7*n)+9 = 4 // - 4

2*n-(7*n)-4+9 = 0

2*n-7*n-4+9 = 0

5-5*n = 0 // - 5

-5*n = -5 // : -5

n = -5/(-5)

n = 1

n = 1

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