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n in (-oo:+oo)
(3/5)*n+7*n = (1/4)*n-(2*n)-(1/5) // - (1/4)*n-(2*n)-(1/5)
(3/5)*n+7*n-((1/4)*n)+2*n+1/5 = 0
(3/5)*n+7*n+(-1/4)*n+2*n+1/5 = 0
187/20*n+1/5 = 0 // - 1/5
187/20*n = -1/5 // : 187/20
n = -1/5/187/20
n = -4/187
n = -4/187
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