9+n+3n=1 - solution

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Solution for 9+n+3n=1 equation:

n in (-oo:+oo)

n+3*n+9 = 1 // - 1

n+3*n-1+9 = 0

4*n+8 = 0 // - 8

4*n = -8 // : 4

n = -8/4

n = -2

n = -2

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