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n in (-oo:+oo)
4*n+(6/7)*n-3 = -93/14 // + -93/14
4*n+(6/7)*n-(-93/14)-3 = 0
4*n+(6/7)*n+93/14-3 = 0
34/7*n+51/14 = 0 // - 51/14
34/7*n = -51/14 // : 34/7
n = -51/14/34/7
n = -3/4
n = -3/4
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