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n in (-oo:+oo)
(-3/4)*n-9 = -129/14 // + -129/14
(-3/4)*n-(-129/14)-9 = 0
(-3/4)*n+129/14-9 = 0
3/14-3/4*n = 0 // - 3/14
-3/4*n = -3/14 // : -3/4
n = -3/14/(-3/4)
n = 2/7
n = 2/7
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