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n in (-oo:+oo)
4*n = (5/7)/30 // - (5/7)/30
4*n-((5/7)/30) = 0
4*n-1/42 = 0
4*n-1/42 = 0 // + 1/42
4*n = 1/42 // : 4
n = 1/42/4
n = 1/168
n = 1/168
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