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n in (-oo:+oo)
(-2/4)/5 = ((-3/1)/2)*n // - ((-3/1)/2)*n
(-2/4)/5-(((-3/1)/2)*n) = 0
(3/2)*n+(-2/4)/5 = 0
3/2*n-1/10 = 0 // + 1/10
3/2*n = 1/10 // : 3/2
n = 1/10/3/2
n = 1/15
n = 1/15
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