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n in (-oo:+oo)
(3*n)/5+n/5+9/10 = (-2/3)/10 // - (-2/3)/10
(3*n)/5+n/5+9/10-((-2/3)/10) = 0
(3*n)/5+n/5+9/10+1/15 = 0
4/5*n+29/30 = 0 // - 29/30
4/5*n = -29/30 // : 4/5
n = -29/30/4/5
n = -29/24
n = -29/24
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