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n in (-oo:+oo)
(-2/4)/5 = -(2*n)-3-1 // + -(2*n)-3-1
2*n+(-2/4)/5+1+3 = 0
2*n+39/10 = 0 // - 39/10
2*n = -39/10 // : 2
n = -39/10/2
n = -39/20
n = -39/20
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