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n in (-oo:+oo)
(1/5)*(3*n+5) = -(n/2+10) // + n/2+10
(1/5)*(3*n+5)+n/2+10 = 0
1/5*(3*n+5)+n/2+10 = 0
(1/5*2*(3*n+5))/2+n/2+(2*10)/2 = 0
1/5*2*(3*n+5)+n+2*10 = 0
11/5*n+2+20 = 0
11/5*n+22 = 0
(11/5*n+22)/2 = 0
(11/5*n+22)/2 = 0 // * 2
11/5*n+22 = 0
11/5*n+22 = 0 // - 22
11/5*n = -22 // : 11/5
n = -22/11/5
n = -10
n = -10
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